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.

-Andi

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