Merge branch 'akpm' (incoming from Andrew)

Merge third batch of fixes from Andrew Morton:
 "Most of the rest.  I still have two large patchsets against AIO and
  IPC, but they're a bit stuck behind other trees and I'm about to
  vanish for six days.

   - random fixlets
   - inotify
   - more of the MM queue
   - show_stack() cleanups
   - DMI update
   - kthread/workqueue things
   - compat cleanups
   - epoll udpates
   - binfmt updates
   - nilfs2
   - hfs
   - hfsplus
   - ptrace
   - kmod
   - coredump
   - kexec
   - rbtree
   - pids
   - pidns
   - pps
   - semaphore tweaks
   - some w1 patches
   - relay updates
   - core Kconfig changes
   - sysrq tweaks"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (109 commits)
  Documentation/sysrq: fix inconstistent help message of sysrq key
  ethernet/emac/sysrq: fix inconstistent help message of sysrq key
  sparc/sysrq: fix inconstistent help message of sysrq key
  powerpc/xmon/sysrq: fix inconstistent help message of sysrq key
  ARM/etm/sysrq: fix inconstistent help message of sysrq key
  power/sysrq: fix inconstistent help message of sysrq key
  kgdb/sysrq: fix inconstistent help message of sysrq key
  lib/decompress.c: fix initconst
  notifier-error-inject: fix module names in Kconfig
  kernel/sys.c: make prctl(PR_SET_MM) generally available
  UAPI: remove empty Kbuild files
  menuconfig: print more info for symbol without prompts
  init/Kconfig: re-order CONFIG_EXPERT options to fix menuconfig display
  kconfig menu: move Virtualization drivers near other virtualization options
  Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
  relay: use macro PAGE_ALIGN instead of FIX_SIZE
  kernel/relay.c: move FIX_SIZE macro into relay.c
  kernel/relay.c: remove unused function argument actor
  drivers/w1/slaves/w1_ds2760.c: fix the error handling in w1_ds2760_add_slave()
  drivers/w1/slaves/w1_ds2781.c: fix the error handling in w1_ds2781_add_slave()
  ...

22 files changed, 600 insertions, 364 deletions

diff --git a/kernel/compat.c b/kernel/compat.c
index 19971d8c7299..1e8f1455117a 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -1138,71 +1138,6 @@ asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
 }
 #endif
 
-struct compat_sysinfo {
-	s32 uptime;
-	u32 loads[3];
-	u32 totalram;
-	u32 freeram;
-	u32 sharedram;
-	u32 bufferram;
-	u32 totalswap;
-	u32 freeswap;
-	u16 procs;
-	u16 pad;
-	u32 totalhigh;
-	u32 freehigh;
-	u32 mem_unit;
-	char _f[20-2*sizeof(u32)-sizeof(int)];
-};
-
-asmlinkage long
-compat_sys_sysinfo(struct compat_sysinfo __user *info)
-{
-	struct sysinfo s;
-
-	do_sysinfo(&s);
-
-	/* Check to see if any memory value is too large for 32-bit and scale
-	 *  down if needed
-	 */
-	if ((s.totalram >> 32) || (s.totalswap >> 32)) {
-		int bitcount = 0;
-
-		while (s.mem_unit < PAGE_SIZE) {
-			s.mem_unit <<= 1;
-			bitcount++;
-		}
-
-		s.totalram >>= bitcount;
-		s.freeram >>= bitcount;
-		s.sharedram >>= bitcount;
-		s.bufferram >>= bitcount;
-		s.totalswap >>= bitcount;
-		s.freeswap >>= bitcount;
-		s.totalhigh >>= bitcount;
-		s.freehigh >>= bitcount;
-	}
-
-	if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
-	    __put_user (s.uptime, &info->uptime) ||
-	    __put_user (s.loads[0], &info->loads[0]) ||
-	    __put_user (s.loads[1], &info->loads[1]) ||
-	    __put_user (s.loads[2], &info->loads[2]) ||
-	    __put_user (s.totalram, &info->totalram) ||
-	    __put_user (s.freeram, &info->freeram) ||
-	    __put_user (s.sharedram, &info->sharedram) ||
-	    __put_user (s.bufferram, &info->bufferram) ||
-	    __put_user (s.totalswap, &info->totalswap) ||
-	    __put_user (s.freeswap, &info->freeswap) ||
-	    __put_user (s.procs, &info->procs) ||
-	    __put_user (s.totalhigh, &info->totalhigh) ||
-	    __put_user (s.freehigh, &info->freehigh) ||
-	    __put_user (s.mem_unit, &info->mem_unit))
-		return -EFAULT;
-
-	return 0;
-}
-
 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
 		       compat_pid_t, pid,
 		       struct compat_timespec __user *, interval)
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index c26278fd4851..0506d447aed2 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -775,7 +775,7 @@ static void sysrq_handle_dbg(int key)
 
 static struct sysrq_key_op sysrq_dbg_op = {
 	.handler	= sysrq_handle_dbg,
-	.help_msg	= "debug(G)",
+	.help_msg	= "debug(g)",
 	.action_msg	= "DEBUG",
 };
 #endif
diff --git a/kernel/kexec.c b/kernel/kexec.c
index b574920cbd4b..59f7b55ba745 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -786,7 +786,7 @@ static int kimage_load_normal_segment(struct kimage *image,
 					 struct kexec_segment *segment)
 {
 	unsigned long maddr;
-	unsigned long ubytes, mbytes;
+	size_t ubytes, mbytes;
 	int result;
 	unsigned char __user *buf;
 
@@ -819,13 +819,9 @@ static int kimage_load_normal_segment(struct kimage *image,
 		/* Start with a clear page */
 		clear_page(ptr);
 		ptr += maddr & ~PAGE_MASK;
-		mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
-		if (mchunk > mbytes)
-			mchunk = mbytes;
-
-		uchunk = mchunk;
-		if (uchunk > ubytes)
-			uchunk = ubytes;
+		mchunk = min_t(size_t, mbytes,
+				PAGE_SIZE - (maddr & ~PAGE_MASK));
+		uchunk = min(ubytes, mchunk);
 
 		result = copy_from_user(ptr, buf, uchunk);
 		kunmap(page);
@@ -850,7 +846,7 @@ static int kimage_load_crash_segment(struct kimage *image,
 	 * We do things a page at a time for the sake of kmap.
 	 */
 	unsigned long maddr;
-	unsigned long ubytes, mbytes;
+	size_t ubytes, mbytes;
 	int result;
 	unsigned char __user *buf;
 
@@ -871,13 +867,10 @@ static int kimage_load_crash_segment(struct kimage *image,
 		}
 		ptr = kmap(page);
 		ptr += maddr & ~PAGE_MASK;
-		mchunk = PAGE_SIZE - (maddr & ~PAGE_MASK);
-		if (mchunk > mbytes)
-			mchunk = mbytes;
-
-		uchunk = mchunk;
-		if (uchunk > ubytes) {
-			uchunk = ubytes;
+		mchunk = min_t(size_t, mbytes,
+				PAGE_SIZE - (maddr & ~PAGE_MASK));
+		uchunk = min(ubytes, mchunk);
+		if (mchunk > uchunk) {
 			/* Zero the trailing part of the page */
 			memset(ptr + uchunk, 0, mchunk - uchunk);
 		}
@@ -1540,14 +1533,13 @@ void vmcoreinfo_append_str(const char *fmt, ...)
 {
 	va_list args;
 	char buf[0x50];
-	int r;
+	size_t r;
 
 	va_start(args, fmt);
 	r = vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
 
-	if (r + vmcoreinfo_size > vmcoreinfo_max_size)
-		r = vmcoreinfo_max_size - vmcoreinfo_size;
+	r = min(r, vmcoreinfo_max_size - vmcoreinfo_size);
 
 	memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
 
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 56dd34976d7b..1296e72e4161 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -77,6 +77,7 @@ static void free_modprobe_argv(struct subprocess_info *info)
 
 static int call_modprobe(char *module_name, int wait)
 {
+	struct subprocess_info *info;
 	static char *envp[] = {
 		"HOME=/",
 		"TERM=linux",
@@ -98,8 +99,15 @@ static int call_modprobe(char *module_name, int wait)
 	argv[3] = module_name;	/* check free_modprobe_argv() */
 	argv[4] = NULL;
 
-	return call_usermodehelper_fns(modprobe_path, argv, envp,
-		wait | UMH_KILLABLE, NULL, free_modprobe_argv, NULL);
+	info = call_usermodehelper_setup(modprobe_path, argv, envp, GFP_KERNEL,
+					 NULL, free_modprobe_argv, NULL);
+	if (!info)
+		goto free_module_name;
+
+	return call_usermodehelper_exec(info, wait | UMH_KILLABLE);
+
+free_module_name:
+	kfree(module_name);
 free_argv:
 	kfree(argv);
 out:
@@ -502,14 +510,28 @@ static void helper_unlock(void)
  * @argv: arg vector for process
  * @envp: environment for process
  * @gfp_mask: gfp mask for memory allocation
+ * @cleanup: a cleanup function
+ * @init: an init function
+ * @data: arbitrary context sensitive data
  *
  * Returns either %NULL on allocation failure, or a subprocess_info
  * structure.  This should be passed to call_usermodehelper_exec to
  * exec the process and free the structure.
+ *
+ * The init function is used to customize the helper process prior to
+ * exec.  A non-zero return code causes the process to error out, exit,
+ * and return the failure to the calling process
+ *
+ * The cleanup function is just before ethe subprocess_info is about to
+ * be freed.  This can be used for freeing the argv and envp.  The
+ * Function must be runnable in either a process context or the
+ * context in which call_usermodehelper_exec is called.
  */
-static
 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
-						  char **envp, gfp_t gfp_mask)
+		char **envp, gfp_t gfp_mask,
+		int (*init)(struct subprocess_info *info, struct cred *new),
+		void (*cleanup)(struct subprocess_info *info),
+		void *data)
 {
 	struct subprocess_info *sub_info;
 	sub_info = kzalloc(sizeof(struct subprocess_info), gfp_mask);
@@ -520,50 +542,27 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
 	sub_info->path = path;
 	sub_info->argv = argv;
 	sub_info->envp = envp;
+
+	sub_info->cleanup = cleanup;
+	sub_info->init = init;
+	sub_info->data = data;
   out:
 	return sub_info;
 }
-
-/**
- * call_usermodehelper_setfns - set a cleanup/init function
- * @info: a subprocess_info returned by call_usermodehelper_setup
- * @cleanup: a cleanup function
- * @init: an init function
- * @data: arbitrary context sensitive data
- *
- * The init function is used to customize the helper process prior to
- * exec.  A non-zero return code causes the process to error out, exit,
- * and return the failure to the calling process
- *
- * The cleanup function is just before ethe subprocess_info is about to
- * be freed.  This can be used for freeing the argv and envp.  The
- * Function must be runnable in either a process context or the
- * context in which call_usermodehelper_exec is called.
- */
-static
-void call_usermodehelper_setfns(struct subprocess_info *info,
-		    int (*init)(struct subprocess_info *info, struct cred *new),
-		    void (*cleanup)(struct subprocess_info *info),
-		    void *data)
-{
-	info->cleanup = cleanup;
-	info->init = init;
-	info->data = data;
-}
+EXPORT_SYMBOL(call_usermodehelper_setup);
 
 /**
  * call_usermodehelper_exec - start a usermode application
  * @sub_info: information about the subprocessa
  * @wait: wait for the application to finish and return status.
- *        when -1 don't wait at all, but you get no useful error back when
- *        the program couldn't be exec'ed. This makes it safe to call
+ *        when UMH_NO_WAIT don't wait at all, but you get no useful error back
+ *        when the program couldn't be exec'ed. This makes it safe to call
  *        from interrupt context.
  *
  * Runs a user-space application.  The application is started
  * asynchronously if wait is not set, and runs as a child of keventd.
  * (ie. it runs with full root capabilities).
  */
-static
 int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
 {
 	DECLARE_COMPLETION_ONSTACK(done);
@@ -615,31 +614,34 @@ unlock:
 	helper_unlock();
 	return retval;
 }
+EXPORT_SYMBOL(call_usermodehelper_exec);
 
-/*
- * call_usermodehelper_fns() will not run the caller-provided cleanup function
- * if a memory allocation failure is experienced.  So the caller might need to
- * check the call_usermodehelper_fns() return value: if it is -ENOMEM, perform
- * the necessaary cleanup within the caller.
+/**
+ * call_usermodehelper() - prepare and start a usermode application
+ * @path: path to usermode executable
+ * @argv: arg vector for process
+ * @envp: environment for process
+ * @wait: wait for the application to finish and return status.
+ *        when UMH_NO_WAIT don't wait at all, but you get no useful error back
+ *        when the program couldn't be exec'ed. This makes it safe to call
+ *        from interrupt context.
+ *
+ * This function is the equivalent to use call_usermodehelper_setup() and
+ * call_usermodehelper_exec().
  */
-int call_usermodehelper_fns(
-	char *path, char **argv, char **envp, int wait,
-	int (*init)(struct subprocess_info *info, struct cred *new),
-	void (*cleanup)(struct subprocess_info *), void *data)
+int call_usermodehelper(char *path, char **argv, char **envp, int wait)
 {
 	struct subprocess_info *info;
 	gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
 
-	info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
-
+	info = call_usermodehelper_setup(path, argv, envp, gfp_mask,
+					 NULL, NULL, NULL);
 	if (info == NULL)
 		return -ENOMEM;
 
-	call_usermodehelper_setfns(info, init, cleanup, data);
-
 	return call_usermodehelper_exec(info, wait);
 }
-EXPORT_SYMBOL(call_usermodehelper_fns);
+EXPORT_SYMBOL(call_usermodehelper);
 
 static int proc_cap_handler(struct ctl_table *table, int write,
 			 void __user *buffer, size_t *lenp, loff_t *ppos)
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 16d8ddd268b1..760e86df8c20 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/freezer.h>
 #include <linux/ptrace.h>
+#include <linux/uaccess.h>
 #include <trace/events/sched.h>
 
 static DEFINE_SPINLOCK(kthread_create_lock);
@@ -135,6 +136,24 @@ void *kthread_data(struct task_struct *task)
 	return to_kthread(task)->data;
 }
 
+/**
+ * probe_kthread_data - speculative version of kthread_data()
+ * @task: possible kthread task in question
+ *
+ * @task could be a kthread task.  Return the data value specified when it
+ * was created if accessible.  If @task isn't a kthread task or its data is
+ * inaccessible for any reason, %NULL is returned.  This function requires
+ * that @task itself is safe to dereference.
+ */
+void *probe_kthread_data(struct task_struct *task)
+{
+	struct kthread *kthread = to_kthread(task);
+	void *data = NULL;
+
+	probe_kernel_read(&data, &kthread->data, sizeof(data));
+	return data;
+}
+
 static void __kthread_parkme(struct kthread *self)
 {
 	__set_current_state(TASK_PARKED);
diff --git a/kernel/panic.c b/kernel/panic.c
index 7c57cc9eee2c..167ec097ce8b 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -22,7 +22,6 @@
 #include <linux/sysrq.h>
 #include <linux/init.h>
 #include <linux/nmi.h>
-#include <linux/dmi.h>
 
 #define PANIC_TIMER_STEP 100
 #define PANIC_BLINK_SPD 18
@@ -400,13 +399,8 @@ struct slowpath_args {
 static void warn_slowpath_common(const char *file, int line, void *caller,
 				 unsigned taint, struct slowpath_args *args)
 {
-	const char *board;
-
 	printk(KERN_WARNING "------------[ cut here ]------------\n");
 	printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
-	board = dmi_get_system_info(DMI_PRODUCT_NAME);
-	if (board)
-		printk(KERN_WARNING "Hardware name: %s\n", board);
 
 	if (args)
 		vprintk(args->fmt, args->args);
diff --git a/kernel/pid.c b/kernel/pid.c
index 047dc6264638..6283d6412aff 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -51,9 +51,6 @@ int pid_max = PID_MAX_DEFAULT;
 int pid_max_min = RESERVED_PIDS + 1;
 int pid_max_max = PID_MAX_LIMIT;
 
-#define BITS_PER_PAGE		(PAGE_SIZE*8)
-#define BITS_PER_PAGE_MASK	(BITS_PER_PAGE-1)
-
 static inline int mk_pid(struct pid_namespace *pid_ns,
 		struct pidmap *map, int off)
 {
@@ -183,15 +180,19 @@ static int alloc_pidmap(struct pid_namespace *pid_ns)
 				break;
 		}
 		if (likely(atomic_read(&map->nr_free))) {
-			do {
+			for ( ; ; ) {
 				if (!test_and_set_bit(offset, map->page)) {
 					atomic_dec(&map->nr_free);
 					set_last_pid(pid_ns, last, pid);
 					return pid;
 				}
 				offset = find_next_offset(map, offset);
+				if (offset >= BITS_PER_PAGE)
+					break;
 				pid = mk_pid(pid_ns, map, offset);
-			} while (offset < BITS_PER_PAGE && pid < pid_max);
+				if (pid >= pid_max)
+					break;
+			}
 		}
 		if (map < &pid_ns->pidmap[(pid_max-1)/BITS_PER_PAGE]) {
 			++map;
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index bea15bdf82b0..69473c4a653f 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -19,8 +19,6 @@
 #include <linux/reboot.h>
 #include <linux/export.h>
 
-#define BITS_PER_PAGE		(PAGE_SIZE*8)
-
 struct pid_cache {
 	int nr_ids;
 	char name[16];
diff --git a/kernel/power/poweroff.c b/kernel/power/poweroff.c
index 68197a4e8fc9..7ef6866b521d 100644
--- a/kernel/power/poweroff.c
+++ b/kernel/power/poweroff.c
@@ -32,7 +32,7 @@ static void handle_poweroff(int key)
 
 static struct sysrq_key_op	sysrq_poweroff_op = {
 	.handler        = handle_poweroff,
-	.help_msg       = "powerOff",
+	.help_msg       = "poweroff(o)",
 	.action_msg     = "Power Off",
 	.enable_mask	= SYSRQ_ENABLE_BOOT,
 };
diff --git a/kernel/printk.c b/kernel/printk.c
index 376914e2869d..96dcfcd9a2d4 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -43,6 +43,7 @@
 #include <linux/rculist.h>
 #include <linux/poll.h>
 #include <linux/irq_work.h>
+#include <linux/utsname.h>
 
 #include <asm/uaccess.h>
 
@@ -2849,4 +2850,65 @@ void kmsg_dump_rewind(struct kmsg_dumper *dumper)
 	raw_spin_unlock_irqrestore(&logbuf_lock, flags);
 }
 EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
+
+static char dump_stack_arch_desc_str[128];
+
+/**
+ * dump_stack_set_arch_desc - set arch-specific str to show with task dumps
+ * @fmt: printf-style format string
+ * @...: arguments for the format string
+ *
+ * The configured string will be printed right after utsname during task
+ * dumps.  Usually used to add arch-specific system identifiers.  If an
+ * arch wants to make use of such an ID string, it should initialize this
+ * as soon as possible during boot.
+ */
+void __init dump_stack_set_arch_desc(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	vsnprintf(dump_stack_arch_desc_str, sizeof(dump_stack_arch_desc_str),
+		  fmt, args);
+	va_end(args);
+}
+
+/**
+ * dump_stack_print_info - print generic debug info for dump_stack()
+ * @log_lvl: log level
+ *
+ * Arch-specific dump_stack() implementations can use this function to
+ * print out the same debug information as the generic dump_stack().
+ */
+void dump_stack_print_info(const char *log_lvl)
+{
+	printk("%sCPU: %d PID: %d Comm: %.20s %s %s %.*s\n",
+	       log_lvl, raw_smp_processor_id(), current->pid, current->comm,
+	       print_tainted(), init_utsname()->release,
+	       (int)strcspn(init_utsname()->version, " "),
+	       init_utsname()->version);
+
+	if (dump_stack_arch_desc_str[0] != '\0')
+		printk("%sHardware name: %s\n",
+		       log_lvl, dump_stack_arch_desc_str);
+
+	print_worker_info(log_lvl, current);
+}
+
+/**
+ * show_regs_print_info - print generic debug info for show_regs()
+ * @log_lvl: log level
+ *
+ * show_regs() implementations can use this function to print out generic
+ * debug information.
+ */
+void show_regs_print_info(const char *log_lvl)
+{
+	dump_stack_print_info(log_lvl);
+
+	printk("%stask: %p ti: %p task.ti: %p\n",
+	       log_lvl, current, current_thread_info(),
+	       task_thread_info(current));
+}
+
 #endif
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index acbd28424d81..17ae54da0ec2 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -24,6 +24,7 @@
 #include <linux/regset.h>
 #include <linux/hw_breakpoint.h>
 #include <linux/cn_proc.h>
+#include <linux/compat.h>
 
 
 static int ptrace_trapping_sleep_fn(void *flags)
@@ -618,6 +619,81 @@ static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
 	return error;
 }
 
+static int ptrace_peek_siginfo(struct task_struct *child,
+				unsigned long addr,
+				unsigned long data)
+{
+	struct ptrace_peeksiginfo_args arg;
+	struct sigpending *pending;
+	struct sigqueue *q;
+	int ret, i;
+
+	ret = copy_from_user(&arg, (void __user *) addr,
+				sizeof(struct ptrace_peeksiginfo_args));
+	if (ret)
+		return -EFAULT;
+
+	if (arg.flags & ~PTRACE_PEEKSIGINFO_SHARED)
+		return -EINVAL; /* unknown flags */
+
+	if (arg.nr < 0)
+		return -EINVAL;
+
+	if (arg.flags & PTRACE_PEEKSIGINFO_SHARED)
+		pending = &child->signal->shared_pending;
+	else
+		pending = &child->pending;
+
+	for (i = 0; i < arg.nr; ) {
+		siginfo_t info;
+		s32 off = arg.off + i;
+
+		spin_lock_irq(&child->sighand->siglock);
+		list_for_each_entry(q, &pending->list, list) {
+			if (!off--) {
+				copy_siginfo(&info, &q->info);
+				break;
+			}
+		}
+		spin_unlock_irq(&child->sighand->siglock);
+
+		if (off >= 0) /* beyond the end of the list */
+			break;
+
+#ifdef CONFIG_COMPAT
+		if (unlikely(is_compat_task())) {
+			compat_siginfo_t __user *uinfo = compat_ptr(data);
+
+			ret = copy_siginfo_to_user32(uinfo, &info);
+			ret |= __put_user(info.si_code, &uinfo->si_code);
+		} else
+#endif
+		{
+			siginfo_t __user *uinfo = (siginfo_t __user *) data;
+
+			ret = copy_siginfo_to_user(uinfo, &info);
+			ret |= __put_user(info.si_code, &uinfo->si_code);
+		}
+
+		if (ret) {
+			ret = -EFAULT;
+			break;
+		}
+
+		data += sizeof(siginfo_t);
+		i++;
+
+		if (signal_pending(current))
+			break;
+
+		cond_resched();
+	}
+
+	if (i > 0)
+		return i;
+
+	return ret;
+}
 
 #ifdef PTRACE_SINGLESTEP
 #define is_singlestep(request)		((request) == PTRACE_SINGLESTEP)
@@ -748,6 +824,10 @@ int ptrace_request(struct task_struct *child, long request,
 		ret = put_user(child->ptrace_message, datalp);
 		break;
 
+	case PTRACE_PEEKSIGINFO:
+		ret = ptrace_peek_siginfo(child, addr, data);
+		break;
+
 	case PTRACE_GETSIGINFO:
 		ret = ptrace_getsiginfo(child, &siginfo);
 		if (!ret)
diff --git a/kernel/range.c b/kernel/range.c
index 9b8ae2d6ed68..071b0ab455cb 100644
--- a/kernel/range.c
+++ b/kernel/range.c
@@ -97,7 +97,8 @@ void subtract_range(struct range *range, int az, u64 start, u64 end)
 				range[i].end = range[j].end;
 				range[i].start = end;
 			} else {
-				printk(KERN_ERR "run of slot in ranges\n");
+				pr_err("%s: run out of slot in ranges\n",
+					__func__);
 			}
 			range[j].end = start;
 			continue;
diff --git a/kernel/relay.c b/kernel/relay.c
index 01ab081ac53a..eef0d113b79e 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -588,7 +588,7 @@ struct rchan *relay_open(const char *base_filename,
 	chan->version = RELAYFS_CHANNEL_VERSION;
 	chan->n_subbufs = n_subbufs;
 	chan->subbuf_size = subbuf_size;
-	chan->alloc_size = FIX_SIZE(subbuf_size * n_subbufs);
+	chan->alloc_size = PAGE_ALIGN(subbuf_size * n_subbufs);
 	chan->parent = parent;
 	chan->private_data = private_data;
 	if (base_filename) {
@@ -1099,8 +1099,7 @@ static size_t relay_file_read_end_pos(struct rchan_buf *buf,
 static int subbuf_read_actor(size_t read_start,
 			     struct rchan_buf *buf,
 			     size_t avail,
-			     read_descriptor_t *desc,
-			     read_actor_t actor)
+			     read_descriptor_t *desc)
 {
 	void *from;
 	int ret = 0;
@@ -1121,15 +1120,13 @@ static int subbuf_read_actor(size_t read_start,
 typedef int (*subbuf_actor_t) (size_t read_start,
 			       struct rchan_buf *buf,
 			       size_t avail,
-			       read_descriptor_t *desc,
-			       read_actor_t actor);
+			       read_descriptor_t *desc);
 
 /*
  *	relay_file_read_subbufs - read count bytes, bridging subbuf boundaries
  */
 static ssize_t relay_file_read_subbufs(struct file *filp, loff_t *ppos,
 					subbuf_actor_t subbuf_actor,
-					read_actor_t actor,
 					read_descriptor_t *desc)
 {
 	struct rchan_buf *buf = filp->private_data;
@@ -1150,7 +1147,7 @@ static ssize_t relay_file_read_subbufs(struct file *filp, loff_t *ppos,
 			break;
 
 		avail = min(desc->count, avail);
-		ret = subbuf_actor(read_start, buf, avail, desc, actor);
+		ret = subbuf_actor(read_start, buf, avail, desc);
 		if (desc->error < 0)
 			break;
 
@@ -1174,8 +1171,7 @@ static ssize_t relay_file_read(struct file *filp,
 	desc.count = count;
 	desc.arg.buf = buffer;
 	desc.error = 0;
-	return relay_file_read_subbufs(filp, ppos, subbuf_read_actor,
-				       NULL, &desc);
+	return relay_file_read_subbufs(filp, ppos, subbuf_read_actor, &desc);
 }
 
 static void relay_consume_bytes(struct rchan_buf *rbuf, int bytes_consumed)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c70a8814a767..5662f58f0b69 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4586,6 +4586,7 @@ void sched_show_task(struct task_struct *p)
 		task_pid_nr(p), ppid,
 		(unsigned long)task_thread_info(p)->flags);
 
+	print_worker_info(KERN_INFO, p);
 	show_stack(p, NULL);
 }
 
diff --git a/kernel/semaphore.c b/kernel/semaphore.c
index 4567fc020fe3..6815171a4fff 100644
--- a/kernel/semaphore.c
+++ b/kernel/semaphore.c
@@ -193,7 +193,7 @@ EXPORT_SYMBOL(up);
 struct semaphore_waiter {
 	struct list_head list;
 	struct task_struct *task;
-	int up;
+	bool up;
 };
 
 /*
@@ -209,12 +209,12 @@ static inline int __sched __down_common(struct semaphore *sem, long state,
 
 	list_add_tail(&waiter.list, &sem->wait_list);
 	waiter.task = task;
-	waiter.up = 0;
+	waiter.up = false;
 
 	for (;;) {
 		if (signal_pending_state(state, task))
 			goto interrupted;
-		if (timeout <= 0)
+		if (unlikely(timeout <= 0))
 			goto timed_out;
 		__set_task_state(task, state);
 		raw_spin_unlock_irq(&sem->lock);
@@ -258,6 +258,6 @@ static noinline void __sched __up(struct semaphore *sem)
 	struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list,
 						struct semaphore_waiter, list);
 	list_del(&waiter->list);
-	waiter->up = 1;
+	waiter->up = true;
 	wake_up_process(waiter->task);
 }
diff --git a/kernel/signal.c b/kernel/signal.c
index 598dc06be421..cede58910f9c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -854,12 +854,14 @@ static void ptrace_trap_notify(struct task_struct *t)
  * Returns true if the signal should be actually delivered, otherwise
  * it should be dropped.
  */
-static int prepare_signal(int sig, struct task_struct *p, bool force)
+static bool prepare_signal(int sig, struct task_struct *p, bool force)
 {
 	struct signal_struct *signal = p->signal;
 	struct task_struct *t;
 
-	if (unlikely(signal->flags & SIGNAL_GROUP_EXIT)) {
+	if (signal->flags & (SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP)) {
+		if (signal->flags & SIGNAL_GROUP_COREDUMP)
+			return sig == SIGKILL;
 		/*
 		 * The process is in the middle of dying, nothing to do.
 		 */
@@ -1160,8 +1162,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
 static void print_fatal_signal(int signr)
 {
 	struct pt_regs *regs = signal_pt_regs();
-	printk(KERN_INFO "%s/%d: potentially unexpected fatal signal %d.\n",
-		current->comm, task_pid_nr(current), signr);
+	printk(KERN_INFO "potentially unexpected fatal signal %d.\n", signr);
 
 #if defined(__i386__) && !defined(__arch_um__)
 	printk(KERN_INFO "code at %08lx: ", regs->ip);
diff --git a/kernel/smp.c b/kernel/smp.c
index 8e451f3ff51b..4dba0f7b72ad 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -100,16 +100,16 @@ void __init call_function_init(void)
  * previous function call. For multi-cpu calls its even more interesting
  * as we'll have to ensure no other cpu is observing our csd.
  */
-static void csd_lock_wait(struct call_single_data *data)
+static void csd_lock_wait(struct call_single_data *csd)
 {
-	while (data->flags & CSD_FLAG_LOCK)
+	while (csd->flags & CSD_FLAG_LOCK)
 		cpu_relax();
 }
 
-static void csd_lock(struct call_single_data *data)
+static void csd_lock(struct call_single_data *csd)
 {
-	csd_lock_wait(data);
-	data->flags = CSD_FLAG_LOCK;
+	csd_lock_wait(csd);
+	csd->flags |= CSD_FLAG_LOCK;
 
 	/*
 	 * prevent CPU from reordering the above assignment
@@ -119,16 +119,16 @@ static void csd_lock(struct call_single_data *data)
 	smp_mb();
 }
 
-static void csd_unlock(struct call_single_data *data)
+static void csd_unlock(struct call_single_data *csd)
 {
-	WARN_ON(!(data->flags & CSD_FLAG_LOCK));
+	WARN_ON(!(csd->flags & CSD_FLAG_LOCK));
 
 	/*
 	 * ensure we're all done before releasing data:
 	 */
 	smp_mb();
 
-	data->flags &= ~CSD_FLAG_LOCK;
+	csd->flags &= ~CSD_FLAG_LOCK;
 }
 
 /*
@@ -137,7 +137,7 @@ static void csd_unlock(struct call_single_data *data)
  * ->func, ->info, and ->flags set.
  */
 static
-void generic_exec_single(int cpu, struct call_single_data *data, int wait)
+void generic_exec_single(int cpu, struct call_single_data *csd, int wait)
 {
 	struct call_single_queue *dst = &per_cpu(call_single_queue, cpu);
 	unsigned long flags;
@@ -145,7 +145,7 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait)
 
 	raw_spin_lock_irqsave(&dst->lock, flags);
 	ipi = list_empty(&dst->list);
-	list_add_tail(&data->list, &dst->list);
+	list_add_tail(&csd->list, &dst->list);
 	raw_spin_unlock_irqrestore(&dst->lock, flags);
 
 	/*
@@ -163,7 +163,7 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait)
 		arch_send_call_function_single_ipi(cpu);
 
 	if (wait)
-		csd_lock_wait(data);
+		csd_lock_wait(csd);
 }
 
 /*
@@ -173,7 +173,6 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait)
 void generic_smp_call_function_single_interrupt(void)
 {
 	struct call_single_queue *q = &__get_cpu_var(call_single_queue);
-	unsigned int data_flags;
 	LIST_HEAD(list);
 
 	/*
@@ -186,25 +185,26 @@ void generic_smp_call_function_single_interrupt(void)
 	raw_spin_unlock(&q->lock);
 
 	while (!list_empty(&list)) {
-		struct call_single_data *data;
+		struct call_single_data *csd;
+		unsigned int csd_flags;
 
-		data = list_entry(list.next, struct call_single_data, list);
-		list_del(&data->list);
+		csd = list_entry(list.next, struct call_single_data, list);
+		list_del(&csd->list);
 
 		/*
-		 * 'data' can be invalid after this call if flags == 0
+		 * 'csd' can be invalid after this call if flags == 0
 		 * (when called through generic_exec_single()),
 		 * so save them away before making the call:
 		 */
-		data_flags = data->flags;
+		csd_flags = csd->flags;
 
-		data->func(data->info);
+		csd->func(csd->info);
 
 		/*
 		 * Unlocked CSDs are valid through generic_exec_single():
 		 */
-		if (data_flags & CSD_FLAG_LOCK)
-			csd_unlock(data);
+		if (csd_flags & CSD_FLAG_LOCK)
+			csd_unlock(csd);
 	}
 }
 
@@ -249,16 +249,16 @@ int smp_call_function_single(int cpu, smp_call_func_t func, void *info,
 		local_irq_restore(flags);
 	} else {
 		if ((unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) {
-			struct call_single_data *data = &d;
+			struct call_single_data *csd = &d;
 
 			if (!wait)
-				data = &__get_cpu_var(csd_data);
+				csd = &__get_cpu_var(csd_data);
 
-			csd_lock(data);
+			csd_lock(csd);
 
-			data->func = func;
-			data->info = info;
-			generic_exec_single(cpu, data, wait);
+			csd->func = func;
+			csd->info = info;
+			generic_exec_single(cpu, csd, wait);
 		} else {
 			err = -ENXIO;	/* CPU not online */
 		}
@@ -325,7 +325,7 @@ EXPORT_SYMBOL_GPL(smp_call_function_any);
  * pre-allocated data structure. Useful for embedding @data inside
  * other structures, for instance.
  */
-void __smp_call_function_single(int cpu, struct call_single_data *data,
+void __smp_call_function_single(int cpu, struct call_single_data *csd,
 				int wait)
 {
 	unsigned int this_cpu;
@@ -343,11 +343,11 @@ void __smp_call_function_single(int cpu, struct call_single_data *data,
 
 	if (cpu == this_cpu) {
 		local_irq_save(flags);
-		data->func(data->info);
+		csd->func(csd->info);
 		local_irq_restore(flags);
 	} else {
-		csd_lock(data);
-		generic_exec_single(cpu, data, wait);
+		csd_lock(csd);
+		generic_exec_single(cpu, csd, wait);
 	}
 	put_cpu();
 }
@@ -369,7 +369,7 @@ void __smp_call_function_single(int cpu, struct call_single_data *data,
 void smp_call_function_many(const struct cpumask *mask,
 			    smp_call_func_t func, void *info, bool wait)
 {
-	struct call_function_data *data;
+	struct call_function_data *cfd;
 	int cpu, next_cpu, this_cpu = smp_processor_id();
 
 	/*
@@ -401,24 +401,24 @@ void smp_call_function_many(const struct cpumask *mask,
 		return;
 	}
 
-	data = &__get_cpu_var(cfd_data);
+	cfd = &__get_cpu_var(cfd_data);
 
-	cpumask_and(data->cpumask, mask, cpu_online_mask);
-	cpumask_clear_cpu(this_cpu, data->cpumask);
+	cpumask_and(cfd->cpumask, mask, cpu_online_mask);
+	cpumask_clear_cpu(this_cpu, cfd->cpumask);
 
 	/* Some callers race with other cpus changing the passed mask */
-	if (unlikely(!cpumask_weight(data->cpumask)))
+	if (unlikely(!cpumask_weight(cfd->cpumask)))
 		return;
 
 	/*
-	 * After we put an entry into the list, data->cpumask
-	 * may be cleared again when another CPU sends another IPI for
-	 * a SMP function call, so data->cpumask will be zero.
+	 * After we put an entry into the list, cfd->cpumask may be cleared
+	 * again when another CPU sends another IPI for a SMP function call, so
+	 * cfd->cpumask will be zero.
 	 */
-	cpumask_copy(data->cpumask_ipi, data->cpumask);
+	cpumask_copy(cfd->cpumask_ipi, cfd->cpumask);
 
-	for_each_cpu(cpu, data->cpumask) {
-		struct call_single_data *csd = per_cpu_ptr(data->csd, cpu);
+	for_each_cpu(cpu, cfd->cpumask) {
+		struct call_single_data *csd = per_cpu_ptr(cfd->csd, cpu);
 		struct call_single_queue *dst =
 					&per_cpu(call_single_queue, cpu);
 		unsigned long flags;
@@ -433,12 +433,13 @@ void smp_call_function_many(const struct cpumask *mask,
 	}
 
 	/* Send a message to all CPUs in the map */
-	arch_send_call_function_ipi_mask(data->cpumask_ipi);
+	arch_send_call_function_ipi_mask(cfd->cpumask_ipi);
 
 	if (wait) {
-		for_each_cpu(cpu, data->cpumask) {
-			struct call_single_data *csd =
-					per_cpu_ptr(data->csd, cpu);
+		for_each_cpu(cpu, cfd->cpumask) {
+			struct call_single_data *csd;
+
+			csd = per_cpu_ptr(cfd->csd, cpu);
 			csd_lock_wait(csd);
 		}
 	}
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 14d7758074aa..aa82723c7202 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -620,8 +620,7 @@ static void remote_softirq_receive(void *data)
 	unsigned long flags;
 	int softirq;
 
-	softirq = cp->priv;
-
+	softirq = *(int *)cp->info;
 	local_irq_save(flags);
 	__local_trigger(cp, softirq);
 	local_irq_restore(flags);
@@ -631,9 +630,8 @@ static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softir
 {
 	if (cpu_online(cpu)) {
 		cp->func = remote_softirq_receive;
-		cp->info = cp;
+		cp->info = &softirq;
 		cp->flags = 0;
-		cp->priv = softirq;
 
 		__smp_call_function_single(cpu, cp, 0);
 		return 0;
diff --git a/kernel/sys.c b/kernel/sys.c
index 0da73cf73e60..afd0f7e125c9 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -49,6 +49,11 @@
 #include <linux/user_namespace.h>
 #include <linux/binfmts.h>
 
+#include <linux/sched.h>
+#include <linux/rcupdate.h>
+#include <linux/uidgid.h>
+#include <linux/cred.h>
+
 #include <linux/kmsg_dump.h>
 /* Move somewhere else to avoid recompiling? */
 #include <generated/utsrelease.h>
@@ -1044,6 +1049,67 @@ change_okay:
 	return old_fsgid;
 }
 
+/**
+ * sys_getpid - return the thread group id of the current process
+ *
+ * Note, despite the name, this returns the tgid not the pid.  The tgid and
+ * the pid are identical unless CLONE_THREAD was specified on clone() in
+ * which case the tgid is the same in all threads of the same group.
+ *
+ * This is SMP safe as current->tgid does not change.
+ */
+SYSCALL_DEFINE0(getpid)
+{
+	return task_tgid_vnr(current);
+}
+
+/* Thread ID - the internal kernel "pid" */
+SYSCALL_DEFINE0(gettid)
+{
+	return task_pid_vnr(current);
+}
+
+/*
+ * Accessing ->real_parent is not SMP-safe, it could
+ * change from under us. However, we can use a stale
+ * value of ->real_parent under rcu_read_lock(), see
+ * release_task()->call_rcu(delayed_put_task_struct).
+ */
+SYSCALL_DEFINE0(getppid)
+{
+	int pid;
+
+	rcu_read_lock();
+	pid = task_tgid_vnr(rcu_dereference(current->real_parent));
+	rcu_read_unlock();
+
+	return pid;
+}
+
+SYSCALL_DEFINE0(getuid)
+{
+	/* Only we change this so SMP safe */
+	return from_kuid_munged(current_user_ns(), current_uid());
+}
+
+SYSCALL_DEFINE0(geteuid)
+{
+	/* Only we change this so SMP safe */
+	return from_kuid_munged(current_user_ns(), current_euid());
+}
+
+SYSCALL_DEFINE0(getgid)
+{
+	/* Only we change this so SMP safe */
+	return from_kgid_munged(current_user_ns(), current_gid());
+}
+
+SYSCALL_DEFINE0(getegid)
+{
+	/* Only we change this so SMP safe */
+	return from_kgid_munged(current_user_ns(), current_egid());
+}
+
 void do_sys_times(struct tms *tms)
 {
 	cputime_t tgutime, tgstime, cutime, cstime;
@@ -1791,7 +1857,6 @@ SYSCALL_DEFINE1(umask, int, mask)
 	return mask;
 }
 
-#ifdef CONFIG_CHECKPOINT_RESTORE
 static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 {
 	struct fd exe;
@@ -1985,17 +2050,12 @@ out:
 	return error;
 }
 
+#ifdef CONFIG_CHECKPOINT_RESTORE
 static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
 {
 	return put_user(me->clear_child_tid, tid_addr);
 }
-
-#else /* CONFIG_CHECKPOINT_RESTORE */
-static int prctl_set_mm(int opt, unsigned long addr,
-			unsigned long arg4, unsigned long arg5)
-{
-	return -EINVAL;
-}
+#else
 static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
 {
 	return -EINVAL;
@@ -2245,3 +2305,148 @@ int orderly_poweroff(bool force)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(orderly_poweroff);
+
+/**
+ * do_sysinfo - fill in sysinfo struct
+ * @info: pointer to buffer to fill
+ */
+static int do_sysinfo(struct sysinfo *info)
+{
+	unsigned long mem_total, sav_total;
+	unsigned int mem_unit, bitcount;
+	struct timespec tp;
+
+	memset(info, 0, sizeof(struct sysinfo));
+
+	ktime_get_ts(&tp);
+	monotonic_to_bootbased(&tp);
+	info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
+
+	get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
+
+	info->procs = nr_threads;
+
+	si_meminfo(info);
+	si_swapinfo(info);
+
+	/*
+	 * If the sum of all the available memory (i.e. ram + swap)
+	 * is less than can be stored in a 32 bit unsigned long then
+	 * we can be binary compatible with 2.2.x kernels.  If not,
+	 * well, in that case 2.2.x was broken anyways...
+	 *
+	 *  -Erik Andersen <andersee@debian.org>
+	 */
+
+	mem_total = info->totalram + info->totalswap;
+	if (mem_total < info->totalram || mem_total < info->totalswap)
+		goto out;
+	bitcount = 0;
+	mem_unit = info->mem_unit;
+	while (mem_unit > 1) {
+		bitcount++;
+		mem_unit >>= 1;
+		sav_total = mem_total;
+		mem_total <<= 1;
+		if (mem_total < sav_total)
+			goto out;
+	}
+
+	/*
+	 * If mem_total did not overflow, multiply all memory values by
+	 * info->mem_unit and set it to 1.  This leaves things compatible
+	 * with 2.2.x, and also retains compatibility with earlier 2.4.x
+	 * kernels...
+	 */
+
+	info->mem_unit = 1;
+	info->totalram <<= bitcount;
+	info->freeram <<= bitcount;
+	info->sharedram <<= bitcount;
+	info->bufferram <<= bitcount;
+	info->totalswap <<= bitcount;
+	info->freeswap <<= bitcount;
+	info->totalhigh <<= bitcount;
+	info->freehigh <<= bitcount;
+
+out:
+	return 0;
+}
+
+SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
+{
+	struct sysinfo val;
+
+	do_sysinfo(&val);
+
+	if (copy_to_user(info, &val, sizeof(struct sysinfo)))
+		return -EFAULT;
+
+	return 0;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_sysinfo {
+	s32 uptime;
+	u32 loads[3];
+	u32 totalram;
+	u32 freeram;
+	u32 sharedram;
+	u32 bufferram;
+	u32 totalswap;
+	u32 freeswap;
+	u16 procs;
+	u16 pad;
+	u32 totalhigh;
+	u32 freehigh;
+	u32 mem_unit;
+	char _f[20-2*sizeof(u32)-sizeof(int)];
+};
+
+COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info)
+{
+	struct sysinfo s;
+
+	do_sysinfo(&s);
+
+	/* Check to see if any memory value is too large for 32-bit and scale
+	 *  down if needed
+	 */
+	if ((s.totalram >> 32) || (s.totalswap >> 32)) {
+		int bitcount = 0;
+
+		while (s.mem_unit < PAGE_SIZE) {
+			s.mem_unit <<= 1;
+			bitcount++;
+		}
+
+		s.totalram >>= bitcount;
+		s.freeram >>= bitcount;
+		s.sharedram >>= bitcount;
+		s.bufferram >>= bitcount;
+		s.totalswap >>= bitcount;
+		s.freeswap >>= bitcount;
+		s.totalhigh >>= bitcount;
+		s.freehigh >>= bitcount;
+	}
+
+	if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
+	    __put_user(s.uptime, &info->uptime) ||
+	    __put_user(s.loads[0], &info->loads[0]) ||
+	    __put_user(s.loads[1], &info->loads[1]) ||
+	    __put_user(s.loads[2], &info->loads[2]) ||
+	    __put_user(s.totalram, &info->totalram) ||
+	    __put_user(s.freeram, &info->freeram) ||
+	    __put_user(s.sharedram, &info->sharedram) ||
+	    __put_user(s.bufferram, &info->bufferram) ||
+	    __put_user(s.totalswap, &info->totalswap) ||
+	    __put_user(s.freeswap, &info->freeswap) ||
+	    __put_user(s.procs, &info->procs) ||
+	    __put_user(s.totalhigh, &info->totalhigh) ||
+	    __put_user(s.freehigh, &info->freehigh) ||
+	    __put_user(s.mem_unit, &info->mem_unit))
+		return -EFAULT;
+
+	return 0;
+}
+#endif /* CONFIG_COMPAT */
diff --git a/kernel/timer.c b/kernel/timer.c
index dbf7a78a1ef1..09bca8ce9771 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1,7 +1,7 @@
 /*
  *  linux/kernel/timer.c
  *
- *  Kernel internal timers, basic process system calls
+ *  Kernel internal timers
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *
@@ -41,6 +41,7 @@
 #include <linux/sched.h>
 #include <linux/sched/sysctl.h>
 #include <linux/slab.h>
+#include <linux/compat.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -1395,61 +1396,6 @@ SYSCALL_DEFINE1(alarm, unsigned int, seconds)
 
 #endif
 
-/**
- * sys_getpid - return the thread group id of the current process
- *
- * Note, despite the name, this returns the tgid not the pid.  The tgid and
- * the pid are identical unless CLONE_THREAD was specified on clone() in
- * which case the tgid is the same in all threads of the same group.
- *
- * This is SMP safe as current->tgid does not change.
- */
-SYSCALL_DEFINE0(getpid)
-{
-	return task_tgid_vnr(current);
-}
-
-/*
- * Accessing ->real_parent is not SMP-safe, it could
- * change from under us. However, we can use a stale
- * value of ->real_parent under rcu_read_lock(), see
- * release_task()->call_rcu(delayed_put_task_struct).
- */
-SYSCALL_DEFINE0(getppid)
-{
-	int pid;
-
-	rcu_read_lock();
-	pid = task_tgid_vnr(rcu_dereference(current->real_parent));
-	rcu_read_unlock();
-
-	return pid;
-}
-
-SYSCALL_DEFINE0(getuid)
-{
-	/* Only we change this so SMP safe */
-	return from_kuid_munged(current_user_ns(), current_uid());
-}
-
-SYSCALL_DEFINE0(geteuid)
-{
-	/* Only we change this so SMP safe */
-	return from_kuid_munged(current_user_ns(), current_euid());
-}
-
-SYSCALL_DEFINE0(getgid)
-{
-	/* Only we change this so SMP safe */
-	return from_kgid_munged(current_user_ns(), current_gid());
-}
-
-SYSCALL_DEFINE0(getegid)
-{
-	/* Only we change this so SMP safe */
-	return from_kgid_munged(current_user_ns(), current_egid());
-}
-
 static void process_timeout(unsigned long __data)
 {
 	wake_up_process((struct task_struct *)__data);
@@ -1557,91 +1503,6 @@ signed long __sched schedule_timeout_uninterruptible(signed long timeout)
 }
 EXPORT_SYMBOL(schedule_timeout_uninterruptible);
 
-/* Thread ID - the internal kernel "pid" */
-SYSCALL_DEFINE0(gettid)
-{
-	return task_pid_vnr(current);
-}
-
-/**
- * do_sysinfo - fill in sysinfo struct
- * @info: pointer to buffer to fill
- */
-int do_sysinfo(struct sysinfo *info)
-{
-	unsigned long mem_total, sav_total;
-	unsigned int mem_unit, bitcount;
-	struct timespec tp;
-
-	memset(info, 0, sizeof(struct sysinfo));
-
-	ktime_get_ts(&tp);
-	monotonic_to_bootbased(&tp);
-	info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
-
-	get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
-
-	info->procs = nr_threads;
-
-	si_meminfo(info);
-	si_swapinfo(info);
-
-	/*
-	 * If the sum of all the available memory (i.e. ram + swap)
-	 * is less than can be stored in a 32 bit unsigned long then
-	 * we can be binary compatible with 2.2.x kernels.  If not,
-	 * well, in that case 2.2.x was broken anyways...
-	 *
-	 *  -Erik Andersen <andersee@debian.org>
-	 */
-
-	mem_total = info->totalram + info->totalswap;
-	if (mem_total < info->totalram || mem_total < info->totalswap)
-		goto out;
-	bitcount = 0;
-	mem_unit = info->mem_unit;
-	while (mem_unit > 1) {
-		bitcount++;
-		mem_unit >>= 1;
-		sav_total = mem_total;
-		mem_total <<= 1;
-		if (mem_total < sav_total)
-			goto out;
-	}
-
-	/*
-	 * If mem_total did not overflow, multiply all memory values by
-	 * info->mem_unit and set it to 1.  This leaves things compatible
-	 * with 2.2.x, and also retains compatibility with earlier 2.4.x
-	 * kernels...
-	 */
-
-	info->mem_unit = 1;
-	info->totalram <<= bitcount;
-	info->freeram <<= bitcount;
-	info->sharedram <<= bitcount;
-	info->bufferram <<= bitcount;
-	info->totalswap <<= bitcount;
-	info->freeswap <<= bitcount;
-	info->totalhigh <<= bitcount;
-	info->freehigh <<= bitcount;
-
-out:
-	return 0;
-}
-
-SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
-{
-	struct sysinfo val;
-
-	do_sysinfo(&val);
-
-	if (copy_to_user(info, &val, sizeof(struct sysinfo)))
-		return -EFAULT;
-
-	return 0;
-}
-
 static int __cpuinit init_timers_cpu(int cpu)
 {
 	int j;
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 154aa12af48e..4aa9f5bc6b2d 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -46,6 +46,7 @@
 #include <linux/rculist.h>
 #include <linux/nodemask.h>
 #include <linux/moduleparam.h>
+#include <linux/uaccess.h>
 
 #include "workqueue_internal.h"
 
@@ -2197,6 +2198,7 @@ __acquires(&pool->lock)
 	worker->current_work = NULL;
 	worker->current_func = NULL;
 	worker->current_pwq = NULL;
+	worker->desc_valid = false;
 	pwq_dec_nr_in_flight(pwq, work_color);
 }
 
@@ -4365,6 +4367,83 @@ unsigned int work_busy(struct work_struct *work)
 }
 EXPORT_SYMBOL_GPL(work_busy);
 
+/**
+ * set_worker_desc - set description for the current work item
+ * @fmt: printf-style format string
+ * @...: arguments for the format string
+ *
+ * This function can be called by a running work function to describe what
+ * the work item is about.  If the worker task gets dumped, this
+ * information will be printed out together to help debugging.  The
+ * description can be at most WORKER_DESC_LEN including the trailing '\0'.
+ */
+void set_worker_desc(const char *fmt, ...)
+{
+	struct worker *worker = current_wq_worker();
+	va_list args;
+
+	if (worker) {
+		va_start(args, fmt);
+		vsnprintf(worker->desc, sizeof(worker->desc), fmt, args);
+		va_end(args);
+		worker->desc_valid = true;
+	}
+}
+
+/**
+ * print_worker_info - print out worker information and description
+ * @log_lvl: the log level to use when printing
+ * @task: target task
+ *
+ * If @task is a worker and currently executing a work item, print out the
+ * name of the workqueue being serviced and worker description set with
+ * set_worker_desc() by the currently executing work item.
+ *
+ * This function can be safely called on any task as long as the
+ * task_struct itself is accessible.  While safe, this function isn't
+ * synchronized and may print out mixups or garbages of limited length.
+ */
+void print_worker_info(const char *log_lvl, struct task_struct *task)
+{
+	work_func_t *fn = NULL;
+	char name[WQ_NAME_LEN] = { };
+	char desc[WORKER_DESC_LEN] = { };
+	struct pool_workqueue *pwq = NULL;
+	struct workqueue_struct *wq = NULL;
+	bool desc_valid = false;
+	struct worker *worker;
+
+	if (!(task->flags & PF_WQ_WORKER))
+		return;
+
+	/*
+	 * This function is called without any synchronization and @task
+	 * could be in any state.  Be careful with dereferences.
+	 */
+	worker = probe_kthread_data(task);
+
+	/*
+	 * Carefully copy the associated workqueue's workfn and name.  Keep
+	 * the original last '\0' in case the original contains garbage.
+	 */
+	probe_kernel_read(&fn, &worker->current_func, sizeof(fn));
+	probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));
+	probe_kernel_read(&wq, &pwq->wq, sizeof(wq));
+	probe_kernel_read(name, wq->name, sizeof(name) - 1);
+
+	/* copy worker description */
+	probe_kernel_read(&desc_valid, &worker->desc_valid, sizeof(desc_valid));
+	if (desc_valid)
+		probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);
+
+	if (fn || name[0] || desc[0]) {
+		printk("%sWorkqueue: %s %pf", log_lvl, name, fn);
+		if (desc[0])
+			pr_cont(" (%s)", desc);
+		pr_cont("\n");
+	}
+}
+
 /*
  * CPU hotplug.
  *
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index 84ab6e1dc6fb..ad83c96b2ece 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -29,15 +29,25 @@ struct worker {
 	struct work_struct	*current_work;	/* L: work being processed */
 	work_func_t		current_func;	/* L: current_work's fn */
 	struct pool_workqueue	*current_pwq; /* L: current_work's pwq */
+	bool			desc_valid;	/* ->desc is valid */
 	struct list_head	scheduled;	/* L: scheduled works */
+
+	/* 64 bytes boundary on 64bit, 32 on 32bit */
+
 	struct task_struct	*task;		/* I: worker task */
 	struct worker_pool	*pool;		/* I: the associated pool */
 						/* L: for rescuers */
-	/* 64 bytes boundary on 64bit, 32 on 32bit */
+
 	unsigned long		last_active;	/* L: last active timestamp */
 	unsigned int		flags;		/* X: flags */
 	int			id;		/* I: worker id */
 
+	/*
+	 * Opaque string set with work_set_desc().  Printed out with task
+	 * dump for debugging - WARN, BUG, panic or sysrq.
+	 */
+	char			desc[WORKER_DESC_LEN];
+
 	/* used only by rescuers to point to the target workqueue */
 	struct workqueue_struct	*rescue_wq;	/* I: the workqueue to rescue */
 };