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Commit 2aa3a7f8 authored by Al Viro's avatar Al Viro
Browse files

preparation for generic kernel_thread() 



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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent a4d94ff8

arch/Kconfig

+3 −0
Original line number Original line Diff line number Diff line
@@ -258,6 +258,9 @@ config ARCH_WANT_OLD_COMPAT_IPC 
	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION

	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION

	bool

	bool





config GENERIC_KERNEL_THREAD

	bool



config HAVE_ARCH_SECCOMP_FILTER

config HAVE_ARCH_SECCOMP_FILTER

	bool

	bool

	help

	help

include/linux/sched.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -2325,6 +2325,9 @@ extern int do_execve(const char *, 
		     const char __user * const __user *, struct pt_regs *);

		     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 *);

extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);

struct task_struct *fork_idle(int);

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 void set_task_comm(struct task_struct *tsk, char *from);

extern char *get_task_comm(char *to, struct task_struct *tsk);

extern char *get_task_comm(char *to, struct task_struct *tsk);

kernel/fork.c

+12 −1
Original line number Original line Diff line number Diff line
@@ -1609,7 +1609,7 @@ long do_fork(unsigned long clone_flags, 
	 * requested, no event is reported; otherwise, report if the event

	 * requested, no event is reported; otherwise, report if the event

	 * for the type of forking is enabled.

	 * 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)

		if (clone_flags & CLONE_VFORK)

			trace = PTRACE_EVENT_VFORK;

			trace = PTRACE_EVENT_VFORK;

		else if ((clone_flags & CSIGNAL) != SIGCHLD)

		else if ((clone_flags & CSIGNAL) != SIGCHLD)
@@ -1659,6 +1659,17 @@ long do_fork(unsigned long clone_flags, 
	return nr;

	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

#ifndef ARCH_MIN_MMSTRUCT_ALIGN

#define ARCH_MIN_MMSTRUCT_ALIGN 0

#define ARCH_MIN_MMSTRUCT_ALIGN 0

#endif

#endif