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    SubjectRe: [PATCH 4/4][diskdump] x86-64 support
    On Tue, Aug 31, 2004 at 06:10:40PM +0900, Takao Indoh wrote:
    > >a spin_trylock would be safe. hd can't be NULL.
    >
    > Could you explain to me why spin_is_locked is not safe?

    it's inherently racy. Also it's always return 0 on UP systems which
    makes it totally useless there.

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