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    SubjectRe: [patch] spinlocks: remove 'volatile'
    On Thu, 2006-07-06 at 07:59 -0400, linux-os (Dick Johnson) wrote:
    > On Thu, 6 Jul 2006, Ingo Molnar wrote:
    > >
    > > * Linus Torvalds <> wrote:
    > >
    > >> I wonder if we should remove the "volatile". There really isn't
    > >> anything _good_ that gcc can do with it, but we've seen gcc code
    > >> generation do stupid things before just because "volatile" seems to
    > >> just disable even proper normal working.
    > Then GCC must be fixed. The keyword volatile is correct. It should
    > force the compiler to read the variable every time it's used.

    this is not really what the C standard says.

    > This is not pointless. If GCC generates bad code, tell the
    > GCC people. The volatile keyword is essential.

    no the "volatile" semantics are vague, trecherous and evil. It's a LOT
    better to insert the well defined "barrier()" in the right places.

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      Last update: 2006-07-06 14:03    [W:0.029 / U:18.100 seconds]
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