linux-kernel - [PATCH 3.12 41/72] metag: Only define atomic_dec_if

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Date:   Mon,  7 Nov 2016 14:04:48 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        James Hogan <james.hogan@...tec.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 41/72] metag: Only define atomic_dec_if_positive conditionally

From: Guenter Roeck <linux@...ck-us.net>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 35d04077ad96ed33ceea2501f5a4f1eacda77218 upstream.

The definition of atomic_dec_if_positive() assumes that
atomic_sub_if_positive() exists, which is only the case if
metag specific atomics are used. This results in the following
build error when trying to build metag1_defconfig.

kernel/ucount.c: In function 'dec_ucount':
kernel/ucount.c:211: error:
	implicit declaration of function 'atomic_sub_if_positive'

Moving the definition of atomic_dec_if_positive() into the metag
conditional code fixes the problem.

Fixes: 6006c0d8ce94 ("metag: Atomics, locks and bitops")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: James Hogan <james.hogan@...tec.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/metag/include/asm/atomic.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/metag/include/asm/atomic.h b/arch/metag/include/asm/atomic.h
index 307ecd2bd9a1..d7d6b9e53e44 100644
--- a/arch/metag/include/asm/atomic.h
+++ b/arch/metag/include/asm/atomic.h
@@ -38,6 +38,7 @@
 #define atomic_dec(v) atomic_sub(1, (v))
 
 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+#define atomic_dec_if_positive(v)       atomic_sub_if_positive(1, v)
 
 #define smp_mb__before_atomic_dec()	barrier()
 #define smp_mb__after_atomic_dec()	barrier()
@@ -46,8 +47,6 @@
 
 #endif
 
-#define atomic_dec_if_positive(v)       atomic_sub_if_positive(1, v)
-
 #include <asm-generic/atomic64.h>
 
 #endif /* __ASM_METAG_ATOMIC_H */
-- 
2.10.2