Use write_trylock_irqsave in ptrace_attach
This patch makes ptrace_attach use write_trylock_irqsave().
[akpm@linux-foundation.org: remove unneeded initialisation]
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index ad7949a..b1d11f1 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -161,6 +161,7 @@
int ptrace_attach(struct task_struct *task)
{
int retval;
+ unsigned long flags;
audit_ptrace(task);
@@ -181,9 +182,7 @@
* cpu's that may have task_lock).
*/
task_lock(task);
- local_irq_disable();
- if (!write_trylock(&tasklist_lock)) {
- local_irq_enable();
+ if (!write_trylock_irqsave(&tasklist_lock, flags)) {
task_unlock(task);
do {
cpu_relax();
@@ -211,7 +210,7 @@
force_sig_specific(SIGSTOP, task);
bad:
- write_unlock_irq(&tasklist_lock);
+ write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task);
out:
return retval;