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

Al Viro
2012-03-22T21:28:28Z

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.