linux-kernel - [PATCH 3.16 100/306] metag: Only define atomic_dec_if

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Message-ID: <lsq.1487198500.404656888@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Guenter Roeck" <linux@...ck-us.net>,
        "James Hogan" <james.hogan@...tec.com>
Subject: [PATCH 3.16 100/306] metag: Only define atomic_dec_if_positive
 conditionally

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

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

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

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: Ben Hutchings <ben@...adent.org.uk>
---
 arch/metag/include/asm/atomic.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/metag/include/asm/atomic.h
+++ b/arch/metag/include/asm/atomic.h
@@ -39,11 +39,10 @@
 #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)
 
 #endif
 
-#define atomic_dec_if_positive(v)       atomic_sub_if_positive(1, v)
-
 #include <asm-generic/atomic64.h>
 
 #endif /* __ASM_METAG_ATOMIC_H */