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    SubjectRe: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it
    On Fri, 8 Dec 2006, Russell King wrote:

    > As proven previously the reverse is also true. And as shown previously
    > the cheaper out of the two for all platforms is the LL/SC based
    > implementation, where the architecture specific implementation can
    > be _either_ LL/SC based or cmpxchg based depending on what is
    > supported in their hardware.

    As also shown in this thread: There are restrictions on what you can do
    between ll/sc. You would not want to use C code there. ll/sc is an thing
    that needs to be restricted to asm code. So this is not a viable proposal
    at all. ll/sc is useful to construct various atomic functions but cannot
    be directly used in C code. cmpxchg can be effectively realized using
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      Last update: 2006-12-08 18:29    [W:0.019 / U:12.484 seconds]
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