linux-kernel - [PATCH 2/3] sched: add a macro to define bitops for task atomic flags

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Message-ID: <541F9CD4.5040407@huawei.com>
Date:	Mon, 22 Sep 2014 11:51:48 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, <keescook@...omium.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: [PATCH 2/3] sched: add a macro to define bitops for task atomic flags

This will simplify code when we add new flags.

Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 include/linux/sched.h | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4557765..04a2ae2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1959,15 +1959,17 @@ static inline void memalloc_noio_restore(unsigned int flags)
 /* Per-process atomic flags. */
 #define PFA_NO_NEW_PRIVS 0	/* May not gain new privileges. */
 
-static inline bool task_no_new_privs(struct task_struct *p)
-{
-	return test_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
-}
-
-static inline void task_set_no_new_privs(struct task_struct *p)
-{
-	set_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
-}
+#define TASK_PFA_BITOPS(name, func)				\
+static inline bool task_##func(struct task_struct *p)		\
+{ return test_bit(PFA_##name, &p->atomic_flags); }		\
+								\
+static inline void task_set_##func(struct task_struct *p)	\
+{ set_bit(PFA_##name, &p->atomic_flags); }			\
+								\
+static inline void task_clear_##func(struct task_struct *p)	\
+{ clear_bit(PFA_##name, &p->atomic_flags); }
+
+TASK_PFA_BITOPS(NO_NEW_PRIVS, no_new_privs)
 
 /*
  * task->jobctl flags
-- 
1.8.0.2


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