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mn10300: convert to generic kernel_thread()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-09-22 18:18:23 -04:00
parent 6e75421014
commit 61b7fbc3f4
3 changed files with 21 additions and 38 deletions
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1
arch/mn10300/Kconfig
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@ -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

5
arch/mn10300/include/asm/processor.h
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@ -132,11 +132,6 @@ static inline void start_thread(struct pt_regs *regs,
/* Free all resources held by a thread. */
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.
*/

53
arch/mn10300/kernel/process.c
View File

@ -161,24 +161,6 @@ 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..
*/
@ -232,30 +214,35 @@ 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;
p->thread.uregs = c_regs;
*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 */
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 */
/* the new TLS pointer is passed in as arg #5 to sys_clone() */
if (clone_flags & CLONE_SETTLS)
c_regs->e2 = current_frame()->d3;
p->thread.pc = (unsigned long) ret_from_fork;
return 0;
}