linux-kernel - [PATCH 2.6.32 31/62] include/linux/sched.h: dont use task->pid/tgid in same_thread_group/has_group_leader

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Message-Id: <20150912225607.896286713@1wt.eu>
Date:	Sun, 13 Sep 2015 00:56:37 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...hat.com>, Michal Hocko <mhocko@...e.cz>,
	Sergey Dyasly <dserrg@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ben Hutchings <ben@...adent.org.uk>,
	Sheng Yong <shengyong1@...wei.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 31/62] include/linux/sched.h: dont use task->pid/tgid in
 same_thread_group/has_group_leader_pid

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Oleg Nesterov <oleg@...hat.com>

commit e1403b8edf669ff49bbdf602cc97fefa2760cb15 upstream.

task_struct->pid/tgid should go away.

1. Change same_thread_group() to use task->signal for comparison.

2. Change has_group_leader_pid(task) to compare task_pid(task) with
   signal->leader_pid.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Sergey Dyasly <dserrg@...il.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Sheng Yong <shengyong1@...wei.com>
(cherry picked from commit a7b4d51399316329b6a3d9eaeab224d83eeebe67)

Signed-off-by: Willy Tarreau <w@....eu>
---
 include/linux/sched.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 56e1771..33c1ec2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2211,15 +2211,15 @@ extern bool current_is_single_threaded(void);
  * all we care about is that we have a task with the appropriate
  * pid, we don't actually care if we have the right task.
  */
-static inline int has_group_leader_pid(struct task_struct *p)
+static inline bool has_group_leader_pid(struct task_struct *p)
 {
-	return p->pid == p->tgid;
+	return task_pid(p) == p->signal->leader_pid;
 }
 
 static inline
-int same_thread_group(struct task_struct *p1, struct task_struct *p2)
+bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
 {
-	return p1->tgid == p2->tgid;
+	return p1->signal == p2->signal;
 }
 
 static inline struct task_struct *next_thread(const struct task_struct *p)
-- 
1.7.12.2.21.g234cd45.dirty



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