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vfork: kill PF_STARTING

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Previously it was (ab)used by utrace.  Then it was wrongly used by the
scheduler code.

Currently it is not used, kill it before it finds the new erroneous user.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2012-03-05 14:59:14 -08:00 committed by Linus Torvalds
parent 57b59c4a14
commit 6e27f63edb
2 changed files with 0 additions and 10 deletions
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1
include/linux/sched.h
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@ -1777,7 +1777,6 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *
/*
* Per process flags
*/
#define PF_STARTING 0x00000002 /* being created */
#define PF_EXITING 0x00000004 /* getting shut down */
#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
#define PF_VCPU 0x00000010 /* I'm a virtual CPU */

9
kernel/fork.c
View File

@ -1046,7 +1046,6 @@ static void copy_flags(unsigned long clone_flags, struct task_struct *p)
new_flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER);
new_flags |= PF_FORKNOEXEC;
new_flags |= PF_STARTING;
p->flags = new_flags;
}
@ -1579,14 +1578,6 @@ long do_fork(unsigned long clone_flags,
get_task_struct(p);
}
/*
* We set PF_STARTING at creation in case tracing wants to
* use this to distinguish a fully live task from one that
* hasn't finished SIGSTOP raising yet. Now we clear it
* and set the child going.
*/
p->flags &= ~PF_STARTING;
wake_up_new_task(p);
/* forking complete and child started to run, tell ptracer */