The patch titled
Subject: ia64: implement atomic64_dec_if_positive
has been added to the -mm tree. Its filename is
ia64-implement-atomic64_dec_if_positive.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ia64-implement-atomic64_dec_if_positive.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ia64-implement-atomic64_dec_if_positive.patch
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------------------------------------------------------
From: Vineet Gupta <Vineet.Gupta1@xxxxxxxxxxxx>
Subject: ia64: implement atomic64_dec_if_positive
This is based on s390 version and needed to get rid of
CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Link: http://lkml.kernel.org/r/1473703083-8625-2-git-send-email-vgupta@xxxxxxxxxxxx
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/include/asm/atomic.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff -puN arch/ia64/include/asm/atomic.h~ia64-implement-atomic64_dec_if_positive arch/ia64/include/asm/atomic.h
--- a/arch/ia64/include/asm/atomic.h~ia64-implement-atomic64_dec_if_positive
+++ a/arch/ia64/include/asm/atomic.h
@@ -269,6 +269,22 @@ static __inline__ long atomic64_add_unle
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
+{
+ long c, old, dec;
+ c = atomic64_read(v);
+ for (;;) {
+ dec = c - 1;
+ if (unlikely(dec < 0))
+ break;
+ old = atomic64_cmpxchg((v), c, dec);
+ if (likely(old == c))
+ break;
+ c = old;
+ }
+ return dec;
+}
+
/*
* Atomically add I to V and return TRUE if the resulting value is
* negative.
_
Patches currently in -mm which might be from Vineet.Gupta1@xxxxxxxxxxxx are
ia64-implement-atomic64_dec_if_positive.patch
atomic64-no-need-for-config_arch_has_atomic64_dec_if_positive.patch
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