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frv: switch to generic kernel_thread()

This commit is contained in:
Al Viro 2012-09-22 18:10:15 -04:00
parent 019f96a345
commit 49ed3398b7
3 changed files with 20 additions and 23 deletions
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1
arch/frv/Kconfig
View File

@ -10,6 +10,7 @@ config FRV
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_CPU_DEVICES
select ARCH_WANT_IPC_PARSE_VERSION
select GENERIC_KERNEL_THREAD
config ZONE_DMA
bool

1
arch/frv/include/asm/processor.h
View File

@ -105,7 +105,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern asmlinkage void save_user_regs(struct user_context *target);
extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);

41
arch/frv/kernel/process.c
View File

@ -170,7 +170,7 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
* set up the kernel stack and exception frames for a new process
*/
int copy_thread(unsigned long clone_flags,
unsigned long usp, unsigned long topstk,
unsigned long usp, unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
@ -178,17 +178,6 @@ int copy_thread(unsigned long clone_flags,
childregs = (struct pt_regs *)
(task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE);
/* set up the userspace frame (the only place that the USP is stored) */
*childregs = *regs;
childregs->sp = usp;
childregs->next_frame = NULL;
if (unlikely(!user_mode(regs)))
p->thread.pc = (unsigned long) ret_from_kernel_thread;
else
p->thread.pc = (unsigned long) ret_from_fork;
p->set_child_tid = p->clear_child_tid = NULL;
p->thread.frame = childregs;
@ -198,6 +187,24 @@ int copy_thread(unsigned long clone_flags,
p->thread.lr = 0;
p->thread.frame0 = childregs;
if (unlikely(!regs)) {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->gr9 = usp; /* function */
childregs->gr8 = arg;
chilregs->psr = PSR_S;
p->thread.pc = (unsigned long) ret_from_kernel_thread;
save_user_regs(p->thread.user);
return 0;
}
/* set up the userspace frame (the only place that the USP is stored) */
*childregs = *regs;
childregs->sp = usp;
childregs->next_frame = NULL;
p->thread.pc = (unsigned long) ret_from_fork;
/* the new TLS pointer is passed in as arg #5 to sys_clone() */
if (clone_flags & CLONE_SETTLS)
childregs->gr29 = childregs->gr12;
@ -320,13 +327,3 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
sizeof(current->thread.user->f));
return 1;
}
int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs = {
.gr8 = (unsigned long)arg;
.gr9 = (unsigned long)fn;
.psr = PSR_S;
};
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}