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metag: Only define atomic_dec_if_positive conditionally

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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@roeck-us.net>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: <stable@vger.kernel.org> # 3.9.x-
This commit is contained in:
Guenter Roeck 2016-10-07 10:40:59 -07:00 committed by James Hogan
parent c8d2bc9bc3
commit 35d04077ad
1 changed files with 1 additions and 2 deletions
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3
arch/metag/include/asm/atomic.h
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@ -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 */