Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit

[Al Viro]

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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