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[PATCH] cpuset fork locking fix

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Move the cpuset_fork() call below the write_unlock_irq call in
kernel/fork.c copy_process().

Since the cpuset-dual-semaphore-locking-overhaul.patch, the cpuset_fork()
routine acquires task_lock(), so cannot be called while holding the
tasklist_lock for write.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Jackson 2005-11-28 13:44:05 -08:00 committed by Linus Torvalds
parent 3148890bfa
commit 8c4b8add83
1 changed files with 1 additions and 2 deletions
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3
kernel/fork.c
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@ -1124,8 +1124,6 @@ static task_t *copy_process(unsigned long clone_flags,
if (unlikely(p->ptrace & PT_PTRACED))
__ptrace_link(p, current->parent);
cpuset_fork(p);
attach_pid(p, PIDTYPE_PID, p->pid);
attach_pid(p, PIDTYPE_TGID, p->tgid);
if (thread_group_leader(p)) {
@ -1142,6 +1140,7 @@ static task_t *copy_process(unsigned long clone_flags,
total_forks++;
write_unlock_irq(&tasklist_lock);
proc_fork_connector(p);
cpuset_fork(p);
retval = 0;
fork_out: