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    SubjectRe: [patch] spinlocks: remove 'volatile'
    Linus Torvalds wrote:

    > It's not that "volatile" is the "portable way". It's that "volatile" is
    > fundamentally not sufficient for the job.

    However it does seem to be good for some things, as you say.

    The volatile casting in atomic_* and *_bit seems to be a good idea
    (now that I think about it) [1].

    Because if you had a barrier there, you'd have to reload everything
    used after an atomic_read or set_bit, etc.

    But it might be nice to wrap that in something rather than use
    volatile directly. force_reload(wordptr); maybe?

    [1] Even though I still can't tell the exact semantics of these
    operations eg. why do we need volatile at all? why do we have
    volatile in the double underscore (non-atomic) versions?

    SUSE Labs, Novell Inc.
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      Last update: 2006-07-08 12:47    [W:0.020 / U:62.244 seconds]
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