Merge branch 'akpm' (patchbomb from Andrew) into next

Merge misc updates from Andrew Morton:

 - a few fixes for 3.16.  Cc'ed to stable so they'll get there somehow.

 - various misc fixes and cleanups

 - most of the ocfs2 queue.  Review is slow...

 - most of MM.  The MM queue is pretty huge this time, but not much in
   the way of feature work.

 - some tweaks under kernel/

 - printk maintenance work

 - updates to lib/

 - checkpatch updates

 - tweaks to init/

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (276 commits)
  fs/autofs4/dev-ioctl.c: add __init to autofs_dev_ioctl_init
  fs/ncpfs/getopt.c: replace simple_strtoul by kstrtoul
  init/main.c: remove an ifdef
  kthreads: kill CLONE_KERNEL, change kernel_thread(kernel_init) to avoid CLONE_SIGHAND
  init/main.c: add initcall_blacklist kernel parameter
  init/main.c: don't use pr_debug()
  fs/binfmt_flat.c: make old_reloc() static
  fs/binfmt_elf.c: fix bool assignements
  fs/efs: convert printk(KERN_DEBUG to pr_debug
  fs/efs: add pr_fmt / use __func__
  fs/efs: convert printk to pr_foo()
  scripts/checkpatch.pl: device_initcall is not the only __initcall substitute
  checkpatch: check stable email address
  checkpatch: warn on unnecessary void function return statements
  checkpatch: prefer kstrto<foo> to sscanf(buf, "%<lhuidx>", &bar);
  checkpatch: add warning for kmalloc/kzalloc with multiply
  checkpatch: warn on #defines ending in semicolon
  checkpatch: make --strict a default for files in drivers/net and net/
  checkpatch: always warn on missing blank line after variable declaration block
  checkpatch: fix wildcard DT compatible string checking
  ...

1 files changed, 32 insertions, 3 deletions

diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index 05654f5e48d5..c4d6d2e20e0d 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -32,6 +32,8 @@
 #include <assert.h>
 #include <ftw.h>
 #include <time.h>
+#include <setjmp.h>
+#include <signal.h>
 #include <sys/types.h>
 #include <sys/errno.h>
 #include <sys/fcntl.h>
@@ -824,21 +826,38 @@ static void show_file(const char *name, const struct stat *st)
 			atime, now - st->st_atime);
 }
 
+static sigjmp_buf sigbus_jmp;
+
+static void * volatile sigbus_addr;
+
+static void sigbus_handler(int sig, siginfo_t *info, void *ucontex)
+{
+	(void)sig;
+	(void)ucontex;
+	sigbus_addr = info ? info->si_addr : NULL;
+	siglongjmp(sigbus_jmp, 1);
+}
+
+static struct sigaction sigbus_action = {
+	.sa_sigaction = sigbus_handler,
+	.sa_flags = SA_SIGINFO,
+};
+
 static void walk_file(const char *name, const struct stat *st)
 {
 	uint8_t vec[PAGEMAP_BATCH];
 	uint64_t buf[PAGEMAP_BATCH], flags;
 	unsigned long nr_pages, pfn, i;
+	off_t off, end = st->st_size;
 	int fd;
-	off_t off;
 	ssize_t len;
 	void *ptr;
 	int first = 1;
 
 	fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
 
-	for (off = 0; off < st->st_size; off += len) {
-		nr_pages = (st->st_size - off + page_size - 1) / page_size;
+	for (off = 0; off < end; off += len) {
+		nr_pages = (end - off + page_size - 1) / page_size;
 		if (nr_pages > PAGEMAP_BATCH)
 			nr_pages = PAGEMAP_BATCH;
 		len = nr_pages * page_size;
@@ -855,11 +874,19 @@ static void walk_file(const char *name, const struct stat *st)
 		if (madvise(ptr, len, MADV_RANDOM))
 			fatal("madvice failed: %s", name);
 
+		if (sigsetjmp(sigbus_jmp, 1)) {
+			end = off + sigbus_addr ? sigbus_addr - ptr : 0;
+			fprintf(stderr, "got sigbus at offset %lld: %s\n",
+					(long long)end, name);
+			goto got_sigbus;
+		}
+
 		/* populate ptes */
 		for (i = 0; i < nr_pages ; i++) {
 			if (vec[i] & 1)
 				(void)*(volatile int *)(ptr + i * page_size);
 		}
+got_sigbus:
 
 		/* turn off harvesting reference bits */
 		if (madvise(ptr, len, MADV_SEQUENTIAL))
@@ -910,6 +937,7 @@ static void walk_page_cache(void)
 
 	kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
 	pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
+	sigaction(SIGBUS, &sigbus_action, NULL);
 
 	if (stat(opt_file, &st))
 		fatal("stat failed: %s\n", opt_file);
@@ -925,6 +953,7 @@ static void walk_page_cache(void)
 
 	close(kpageflags_fd);
 	close(pagemap_fd);
+	signal(SIGBUS, SIG_DFL);
 }
 
 static void parse_file(const char *name)