linux-kernel - [PATCH 3/3] ptrace: annotate siglock acquirement

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Date:	Sun, 22 Aug 2010 19:22:16 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Roland McGrath <roland@...hat.com>, Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] ptrace: annotate siglock acquirement

lock_task_sighand() conditionally acquires sighand->siglock in case of
returning non-NULL but unlock_task_sighand() releases it unconditionally.
This leads sparse to complain about the lock context imbalance. Annotate it
to make sparse happier.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 kernel/ptrace.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1abbb4d..4553275 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -438,6 +438,7 @@ static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
 	int error = -ESRCH;
 
 	if (lock_task_sighand(child, &flags)) {
+		__acquire(&child->sighand->siglock);
 		error = -EINVAL;
 		if (likely(child->last_siginfo != NULL)) {
 			*info = *child->last_siginfo;
@@ -454,6 +455,7 @@ static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
 	int error = -ESRCH;
 
 	if (lock_task_sighand(child, &flags)) {
+		__acquire(&child->sighand->siglock);
 		error = -EINVAL;
 		if (likely(child->last_siginfo != NULL)) {
 			*child->last_siginfo = *info;
-- 
1.7.0.4

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