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    SubjectRe: Should io(read|write)(8|16|32)_rep take (const|) volatile u(8|16|32) __iomem *addr?
    Michael K. Edwards wrote:
    > Doubtless this is on purpose, but it's not clear to me why that should
    > be true for these particular functions/macros. I shouldn't have to
    > cast away the volatile on a pointer to hardware registers in order to
    > pass it into writel(), should I? And it shouldn't be forbidden for
    > the caller to declare the pointer volatile so that the compiler
    > catches attempts to pass it into non-volatile interfaces, should it?

    Therein lies your bug: you should not be annotating your __iomem
    pointers with volatile.

    That's why volatile is found in the implementation and not the
    prototypes of the accessor functions.


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      Last update: 2007-02-02 22:45    [W:0.020 / U:107.208 seconds]
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