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SubjectRe: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap
> All of that said, I am not even sure we have a bit left in the page
> flags on smaller architectures :/.

How about

#define PG_checked 8 /* kill me in 2.5.<early>. */


At least PG_uncached isn't used on many architectures too, so could
be reused. I don't know why those that use it don't check VMAs instead.

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