From 65f22a906e154e8086ed561904d09c3586de85f4 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 6 Sep 2012 15:48:11 -0400
Subject: s390: fold execve_tail() into start_thread(), convert to generic
sys_execve()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/s390/include/asm/processor.h | 3 +++
1 file changed, 3 insertions(+)
(limited to 'arch/s390/include/asm/processor.h')
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 11e4e3236937..0bc77619c3a3 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -32,6 +32,7 @@ static inline void get_cpu_id(struct cpuid *ptr)
extern void s390_adjust_jiffies(void);
extern const struct seq_operations cpuinfo_op;
extern int sysctl_ieee_emulation_warnings;
+extern void execve_tail(void);
/*
* User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
@@ -114,6 +115,7 @@ struct stack_frame {
regs->psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp; \
+ execve_tail(); \
} while (0)
#define start_thread31(regs, new_psw, new_stackp) do { \
@@ -123,6 +125,7 @@ struct stack_frame {
__tlb_flush_mm(current->mm); \
crst_table_downgrade(current->mm, 1UL << 31); \
update_mm(current->mm, current); \
+ execve_tail(); \
} while (0)
/* Forward declaration, a strange C thing */
--
cgit v1.2.3
From f9a7e025dfc28783fd2b05812e663251acf4bf21 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 21 Sep 2012 20:48:32 -0400
Subject: s390: switch to generic kernel_thread()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/s390/Kconfig | 1 +
arch/s390/include/asm/processor.h | 1 -
arch/s390/kernel/process.c | 72 ++++++++++++++++++---------------------
3 files changed, 34 insertions(+), 40 deletions(-)
(limited to 'arch/s390/include/asm/processor.h')
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 107610e01a29..57442393bac7 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -125,6 +125,7 @@ config S390
select GENERIC_CLOCKEVENTS
select KTIME_SCALAR if 32BIT
select HAVE_ARCH_SECCOMP_FILTER
+ select GENERIC_KERNEL_THREAD
config SCHED_OMIT_FRAME_POINTER
def_bool y
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 0bc77619c3a3..da6f5baeee5c 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -135,7 +135,6 @@ struct seq_file;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/*
* Return saved PC of a blocked thread.
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 2868a364ff94..bab088de4569 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -98,25 +98,6 @@ void cpu_idle(void)
extern void __kprobes kernel_thread_starter(void);
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- regs.psw.mask = psw_kernel_bits |
- PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
- regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE;
- regs.gprs[9] = (unsigned long) fn;
- regs.gprs[10] = (unsigned long) arg;
- regs.gprs[11] = (unsigned long) do_exit;
- regs.orig_gpr2 = -1;
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
- 0, ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Free current thread data structures etc..
*/
@@ -133,7 +114,7 @@ void release_thread(struct task_struct *dead_task)
}
int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct thread_info *ti;
@@ -145,20 +126,44 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
p->thread.ksp = (unsigned long) frame;
- /* Store access registers to kernel stack of new process. */
- frame->childregs = *regs;
- frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
- frame->childregs.gprs[15] = new_stackp;
- frame->sf.back_chain = 0;
+ /* Save access registers to new thread structure. */
+ save_access_regs(&p->thread.acrs[0]);
+ /* start new process with ar4 pointing to the correct address space */
+ p->thread.mm_segment = get_fs();
+ /* Don't copy debug registers */
+ memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
+ memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
+ clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
+ clear_tsk_thread_flag(p, TIF_PER_TRAP);
+ /* Initialize per thread user and system timer values */
+ ti = task_thread_info(p);
+ ti->user_timer = 0;
+ ti->system_timer = 0;
+ frame->sf.back_chain = 0;
/* new return point is ret_from_fork */
frame->sf.gprs[8] = (unsigned long) ret_from_fork;
-
/* fake return stack for resume(), don't go back to schedule */
frame->sf.gprs[9] = (unsigned long) frame;
- /* Save access registers to new thread structure. */
- save_access_regs(&p->thread.acrs[0]);
+ /* Store access registers to kernel stack of new process. */
+ if (unlikely(!regs)) {
+ /* kernel thread */
+ memset(&frame->childregs, 0, sizeof(struct pt_regs));
+ frame->childregs.psw.mask = psw_kernel_bits | PSW_MASK_DAT |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
+ frame->childregs.psw.addr = PSW_ADDR_AMODE |
+ (unsigned long) kernel_thread_starter;
+ frame->childregs.gprs[9] = new_stackp; /* function */
+ frame->childregs.gprs[10] = arg;
+ frame->childregs.gprs[11] = (unsigned long) do_exit;
+ frame->childregs.orig_gpr2 = -1;
+
+ return 0;
+ }
+ frame->childregs = *regs;
+ frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
+ frame->childregs.gprs[15] = new_stackp;
#ifndef CONFIG_64BIT
/*
@@ -184,17 +189,6 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
}
}
#endif /* CONFIG_64BIT */
- /* start new process with ar4 pointing to the correct address space */
- p->thread.mm_segment = get_fs();
- /* Don't copy debug registers */
- memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
- memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
- clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
- clear_tsk_thread_flag(p, TIF_PER_TRAP);
- /* Initialize per thread user and system timer values */
- ti = task_thread_info(p);
- ti->user_timer = 0;
- ti->system_timer = 0;
return 0;
}
--
cgit v1.2.3