fork: call complete_vfork_done() after clearing child_tid and flushing rss-counters
Child should wake up the parent from vfork() only after finishing all operations with shared mm. There is no sense in using CLONE_CHILD_CLEARTID together with CLONE_VFORK, but it looks more accurate now. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Markus Trippelsdorf <markus@trippelsdorf.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -787,9 +787,6 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
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/* Get rid of any cached register state */
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deactivate_mm(tsk, mm);
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if (tsk->vfork_done)
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complete_vfork_done(tsk);
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/*
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* If we're exiting normally, clear a user-space tid field if
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* requested. We leave this alone when dying by signal, to leave
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@ -810,6 +807,13 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
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}
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tsk->clear_child_tid = NULL;
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}
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/*
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* All done, finally we can wake up parent and return this mm to him.
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* Also kthread_stop() uses this completion for synchronization.
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*/
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if (tsk->vfork_done)
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complete_vfork_done(tsk);
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}
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/*
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