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preparation for generic kernel_thread()

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Let architectures select GENERIC_KERNEL_THREAD and have their copy_thread()
treat NULL regs as "it came from kernel_thread(), sp argument contains
the function new thread will be calling and stack_size - the argument for
that function".  Switching the architectures begins shortly...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-09-21 19:55:31 -04:00
parent a4d94ff8aa
commit 2aa3a7f866
3 changed files with 18 additions and 1 deletions
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13
kernel/fork.c
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@ -1609,7 +1609,7 @@ long do_fork(unsigned long clone_flags,
* requested, no event is reported; otherwise, report if the event
* for the type of forking is enabled.
*/
if (likely(user_mode(regs)) && !(clone_flags & CLONE_UNTRACED)) {
if (!(clone_flags & CLONE_UNTRACED) && likely(user_mode(regs))) {
if (clone_flags & CLONE_VFORK)
trace = PTRACE_EVENT_VFORK;
else if ((clone_flags & CSIGNAL) != SIGCHLD)
@ -1659,6 +1659,17 @@ long do_fork(unsigned long clone_flags,
return nr;
}
#ifdef CONFIG_GENERIC_KERNEL_THREAD
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, NULL,
(unsigned long)arg, NULL, NULL);
}
#endif
#ifndef ARCH_MIN_MMSTRUCT_ALIGN
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif