linux-kernel - [tip:perfcounters/core] x86, perfcounters: add atomic64

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Date:	Tue, 7 Apr 2009 09:36:45 GMT
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] x86, perfcounters: add atomic64_xchg()

Commit-ID:  b226fa12991d6ee9b6b13a7e1de88ec5d25f5007
Gitweb:     http://git.kernel.org/tip/b226fa12991d6ee9b6b13a7e1de88ec5d25f5007
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Tue, 7 Apr 2009 11:30:17 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 7 Apr 2009 11:32:43 +0200

x86, perfcounters: add atomic64_xchg()

Complete atomic64_t support on the 32-bit side by adding atomic64_xch().

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20090406094518.445450972@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/include/asm/atomic_32.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/atomic_32.h b/arch/x86/include/asm/atomic_32.h
index 977250e..a9fef6c 100644
--- a/arch/x86/include/asm/atomic_32.h
+++ b/arch/x86/include/asm/atomic_32.h
@@ -306,6 +306,12 @@ static inline void atomic64_set(atomic64_t *ptr, unsigned long long new_val)
 	} while (atomic64_cmpxchg(ptr, old_val, new_val) != old_val);
 }
 
+static inline void
+atomic64_xchg(atomic64_t *ptr, unsigned long long new_val)
+{
+	atomic64_set(ptr, new_val);
+}
+
 /**
  * atomic64_read - read atomic64 variable
  * @ptr:      pointer to type atomic64_t
--
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