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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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3
arch/Kconfig
View file

@ -258,6 +258,9 @@ config ARCH_WANT_OLD_COMPAT_IPC
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
bool
config GENERIC_KERNEL_THREAD
bool
config HAVE_ARCH_SECCOMP_FILTER
bool
help

3
include/linux/sched.h
View file

@ -2325,6 +2325,9 @@ extern int do_execve(const char *,
const char __user * const __user *, struct pt_regs *);
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
struct task_struct *fork_idle(int);
#ifdef CONFIG_GENERIC_KERNEL_THREAD
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
#endif
extern void set_task_comm(struct task_struct *tsk, char *from);
extern char *get_task_comm(char *to, struct task_struct *tsk);

13
kernel/fork.c
View file

@ -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