linux-kernel - [PATCH UPDATED 01/17] ptrace: remove silly wait_trap variable from ptrace

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Date:	Thu, 2 Jun 2011 20:39:53 +0900
From:	Tejun Heo <tj@...nel.org>
To:	oleg@...hat.com
Cc:	vda.linux@...glemail.com, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu, bdonlan@...il.com,
	pedro@...esourcery.com
Subject: [PATCH UPDATED 01/17] ptrace: remove silly wait_trap variable from
 ptrace_attach()

>From ead8735f43a21993c78e6e4ed5627da6ec4911bd Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@...nel.org>
Date: Thu, 2 Jun 2011 11:13:59 +0200

Remove local variable wait_trap which determines whether to wait for
!TRAPPING or not and simply wait for it if attach was successful.

-v2: Oleg pointed out wait should happen iff attach was successful.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>
---
 kernel/ptrace.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 2df1157..4f689cb 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -184,7 +184,6 @@ bool ptrace_may_access(struct task_struct *task, unsigned int mode)
 
 static int ptrace_attach(struct task_struct *task)
 {
-	bool wait_trap = false;
 	int retval;
 
 	audit_ptrace(task);
@@ -246,7 +245,6 @@ static int ptrace_attach(struct task_struct *task)
 	if (task_is_stopped(task)) {
 		task->group_stop |= GROUP_STOP_PENDING | GROUP_STOP_TRAPPING;
 		signal_wake_up(task, 1);
-		wait_trap = true;
 	}
 
 	spin_unlock(&task->sighand->siglock);
@@ -257,7 +255,7 @@ unlock_tasklist:
 unlock_creds:
 	mutex_unlock(&task->signal->cred_guard_mutex);
 out:
-	if (wait_trap)
+	if (!retval)
 		wait_event(current->signal->wait_chldexit,
 			   !(task->group_stop & GROUP_STOP_TRAPPING));
 	return retval;
-- 
1.7.5.2

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