From: Paul Jackson Date: Mon, 28 Nov 2005 21:44:05 +0000 (-0800) Subject: [PATCH] cpuset fork locking fix X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8c4b8add83c93306b07d78469fd351dc462e4b66;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [PATCH] cpuset fork locking fix 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/fork.c b/kernel/fork.c index d0d49879ab7c..fb8572a42297 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -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: