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    SubjectRe: [PATCH 2.6.13] lockless pagecache 2/7
    Christoph Lameter wrote:
    > On Fri, 2 Sep 2005, Nick Piggin wrote:
    >>Implement atomic_cmpxchg for i386 and ppc64. Is there any
    >>architecture that won't be able to implement such an operation?
    > Something like that used to be part of the page fault scalability
    > patchset. You contributed to it last year. Here is the latest version of
    > that. May need some work though.

    Thanks Christoph, I think this will be required to support 386.
    In the worst case, we could provide a fallback path and take
    ->tree_lock in pagecache lookups if there is no atomic_cmpxchg,
    however I would much prefer all architectures get an atomic_cmpxchg,
    and I think it should turn out to be a generally useful primitive.

    I may trim this down to only provide what is needed for atomic_cmpxchg
    if that is OK?


    SUSE Labs, Novell Inc.

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