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    Subject[tip:perfcounters/core] x86, perfcounters: add atomic64_xchg()
    Commit-ID:  b226fa12991d6ee9b6b13a7e1de88ec5d25f5007
    Gitweb: http://git.kernel.org/tip/b226fa12991d6ee9b6b13a7e1de88ec5d25f5007
    Author: Ingo Molnar <mingo@elte.hu>
    AuthorDate: Tue, 7 Apr 2009 11:30:17 +0200
    Committer: Ingo Molnar <mingo@elte.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@chello.nl>
    LKML-Reference: <20090406094518.445450972@chello.nl>
    Signed-off-by: Ingo Molnar <mingo@elte.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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