| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 083/108] frv: add atomic64_add_unless() | Date | Thu, 15 Jun 2017 19:53:29 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
[ Upstream commit 545d58f677b21401f6de1ac12c25cc109f903ace ]
The build of frv allmodconfig was failing with the error: lib/atomic64_test.c:209:9: error:
implicit declaration of function 'atomic64_add_unless'
All the atomic64 operations were defined in frv, but atomic64_add_unless() was not done.
Implement atomic64_add_unless() as done in other arches.
Link: http://lkml.kernel.org/r/1484781236-6698-1-git-send-email-sudipm.mukherjee@gmail.com Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/frv/include/asm/atomic.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
--- a/arch/frv/include/asm/atomic.h +++ b/arch/frv/include/asm/atomic.h @@ -161,6 +161,22 @@ static __inline__ int __atomic_add_unles return c; } +static inline int atomic64_add_unless(atomic64_t *v, long long i, long long u) +{ + long long c, old; + + c = atomic64_read(v); + for (;;) { + if (unlikely(c == u)) + break; + old = atomic64_cmpxchg(v, c, c + i); + if (likely(old == c)) + break; + c = old; + } + return c != u; +} + #define ATOMIC_OP(op) \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \
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