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[PATCH] sys_get_robust_list(): don't take tasklist_lock

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use rcu locks for find_task_by_pid().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-09-29 02:00:55 -07:00 committed by Linus Torvalds
parent d359b549bf
commit aaa2a97eb9
1 changed files with 3 additions and 3 deletions
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6
kernel/futex.c
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@ -1624,7 +1624,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user **head_ptr,
struct task_struct *p;
ret = -ESRCH;
read_lock(&tasklist_lock);
rcu_read_lock();
p = find_task_by_pid(pid);
if (!p)
goto err_unlock;
@ -1633,7 +1633,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user **head_ptr,
!capable(CAP_SYS_PTRACE))
goto err_unlock;
head = p->robust_list;
read_unlock(&tasklist_lock);
rcu_read_unlock();
}
if (put_user(sizeof(*head), len_ptr))
@ -1641,7 +1641,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user **head_ptr,
return put_user(head, head_ptr);
err_unlock:
read_unlock(&tasklist_lock);
rcu_read_unlock();
return ret;
}