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authorAl Viro <viro@zeniv.linux.org.uk>2012-09-22 18:18:23 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-01 00:54:29 -0400
commit61b7fbc3f4ebdcfd34f9438adfab8df936a19e33 (patch)
tree95d590708d5f156f11ed891f9a88b296a2b89f22 /arch/mn10300
parent6e75421014cd02cc66298d35c4667e493da78914 (diff)
downloadlinux-linaro-stable-61b7fbc3f4ebdcfd34f9438adfab8df936a19e33.tar.gz
mn10300: convert to generic kernel_thread()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/mn10300')
-rw-r--r--arch/mn10300/Kconfig1
-rw-r--r--arch/mn10300/include/asm/processor.h5
-rw-r--r--arch/mn10300/kernel/process.c49
3 files changed, 19 insertions, 36 deletions
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 5cfb086b3903..ddbdc33471a8 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -8,6 +8,7 @@ config MN10300
select HAVE_ARCH_KGDB
select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
select GENERIC_CLOCKEVENTS
+ select GENERIC_KERNEL_THREAD
config AM33_2
def_bool n
diff --git a/arch/mn10300/include/asm/processor.h b/arch/mn10300/include/asm/processor.h
index 0b844a254067..8b80b19d0c8a 100644
--- a/arch/mn10300/include/asm/processor.h
+++ b/arch/mn10300/include/asm/processor.h
@@ -133,11 +133,6 @@ static inline void start_thread(struct pt_regs *regs,
extern void release_thread(struct task_struct *);
/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
-/*
* Return saved PC of a blocked thread.
*/
extern unsigned long thread_saved_pc(struct task_struct *tsk);
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index 49af5ca89343..8ee09d828c43 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -162,24 +162,6 @@ void show_regs(struct pt_regs *regs)
}
/*
- * create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs = {
- .a0 = (unsigned long) fn;
- .d0 = (unsigned long) arg;
- };
-
- local_save_flags(regs.epsw);
- regs.epsw |= EPSW_IE | EPSW_IM_7;
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0,
- NULL, NULL);
-}
-
-/*
* free current thread data structures etc..
*/
void exit_thread(void)
@@ -232,29 +214,34 @@ int copy_thread(unsigned long clone_flags,
/* allocate the userspace exception frame and set it up */
c_ksp -= sizeof(struct pt_regs);
c_regs = (struct pt_regs *) c_ksp;
+ c_ksp -= 12; /* allocate function call ABI slack */
+ /* set up things up so the scheduler can start the new task */
p->thread.uregs = c_regs;
+ ti->frame = c_regs;
+ p->thread.a3 = (unsigned long) c_regs;
+ p->thread.sp = c_ksp;
+ p->thread.wchan = p->thread.pc;
+ p->thread.usp = c_usp;
+
+ if (unlikely(!kregs)) {
+ memset(c_regs, 0, sizeof(struct pt_regs));
+ c_regs->a0 = c_usp; /* function */
+ c_regs->d0 = ustk_size; /* argument */
+ local_save_flags(c_regs->epsw);
+ c_regs->epsw |= EPSW_IE | EPSW_IM_7;
+ p->thread.pc = (unsigned long) ret_from_kernel_thread;
+ return 0;
+ }
*c_regs = *kregs;
c_regs->sp = c_usp;
c_regs->epsw &= ~EPSW_FE; /* my FPU */
- c_ksp -= 12; /* allocate function call ABI slack */
-
/* the new TLS pointer is passed in as arg #5 to sys_clone() */
if (clone_flags & CLONE_SETTLS)
c_regs->e2 = current_frame()->d3;
- if (unlikely(!user_mode(kregs)))
- p->thread.pc = (unsigned long) ret_from_kernel_thread;
- else
- p->thread.pc = (unsigned long) ret_from_fork;
-
- /* set up things up so the scheduler can start the new task */
- ti->frame = c_regs;
- p->thread.a3 = (unsigned long) c_regs;
- p->thread.sp = c_ksp;
- p->thread.wchan = p->thread.pc;
- p->thread.usp = c_usp;
+ p->thread.pc = (unsigned long) ret_from_fork;
return 0;
}