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SubjectRe: [PATCH -tip] mm: introduce __GFP_PANIC modifier

Could you try to avoid consuming another GFP flag? __GFP_BITS_SHIFT is
used elsewhere to figure out where to put miscellanous flags into the gfp
mask. This is pretty limited right now and so the patch does work.

But maybe we can combine some flags __GFP_NOFAIL | __GFP_REPEAT or so?

__GFP_NOFAIL already has the semantics that the allocation cannot fail and
that the page allocator must never return NULL.

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