Hi,
This patch makes ptrace_attach use write_trylock_irqsave.
Signed-off-by: Sripathi Kodi <[email protected]>
---
kernel/ptrace.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
Index: linux-2.6.21/kernel/ptrace.c
===================================================================
--- linux-2.6.21.orig/kernel/ptrace.c
+++ linux-2.6.21/kernel/ptrace.c
@@ -160,6 +160,7 @@ int ptrace_may_attach(struct task_struct
int ptrace_attach(struct task_struct *task)
{
int retval;
+ unsigned long flags = 0;
retval = -EPERM;
if (task->pid <= 1)
@@ -178,9 +179,7 @@ repeat:
* 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();
@@ -208,7 +207,7 @@ repeat:
force_sig_specific(SIGSTOP, task);
bad:
- write_unlock_irq(&tasklist_lock);
+ write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task);
out:
return retval;
-
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