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    SubjectRe: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit
    On Thu, Mar 22, 2012 at 02:26:47PM -0700, Andrew Morton wrote:
    > It would be nice to find some way of triggering compiler warnings or
    > sparse warnings if someone mixes a 32-bit type with a vm_flags_t. Any
    > thoughts on this?
    > (Maybe that's what __nocast does, but Documentation/sparse.txt doesn't
    > describe it)

    Use __bitwise for that - check how gfp_t is handled.

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