linux-kernel - [PATCH 01/14] locking/atomic: import atomic_dec_not

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Message-Id: <20170130183938.12702-1-fabf@skynet.be>
Date:   Mon, 30 Jan 2017 19:39:38 +0100
From:   Fabian Frederick <fabf@...net.be>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Fabian Frederick <fabf@...net.be>
Subject: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero()

complementary definition to atomic_inc_not_zero() featured in
lib/fault-inject.c

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 include/linux/atomic.h | 2 ++
 lib/fault-inject.c     | 2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index e71835b..d8e6551 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -517,6 +517,8 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
 #define atomic_inc_not_zero(v)		atomic_add_unless((v), 1, 0)
 #endif
 
+#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
+
 #ifndef atomic_andnot
 static inline void atomic_andnot(int i, atomic_t *v)
 {
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 6a823a5..4ad5dcc 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -52,8 +52,6 @@ static void fail_dump(struct fault_attr *attr)
 	}
 }
 
-#define atomic_dec_not_zero(v)		atomic_add_unless((v), -1, 0)
-
 static bool fail_task(struct fault_attr *attr, struct task_struct *task)
 {
 	return !in_interrupt() && task->make_it_fail;
-- 
2.9.3