Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

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

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

6
kernel/futex.c
View file

@ -1624,7 +1624,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user **head_ptr,
struct task_struct *p; struct task_struct *p;
ret = -ESRCH; ret = -ESRCH;
read_lock(&tasklist_lock); rcu_read_lock();
p = find_task_by_pid(pid); p = find_task_by_pid(pid);
if (!p) if (!p)
goto err_unlock; goto err_unlock;
@ -1633,7 +1633,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user **head_ptr,
!capable(CAP_SYS_PTRACE)) !capable(CAP_SYS_PTRACE))
goto err_unlock; goto err_unlock;
head = p->robust_list; head = p->robust_list;
read_unlock(&tasklist_lock); rcu_read_unlock();
} }
if (put_user(sizeof(*head), len_ptr)) 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); return put_user(head, head_ptr);
err_unlock: err_unlock:
read_unlock(&tasklist_lock); rcu_read_unlock();
return ret; return ret;
} }