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SubjectRe: [PATCH] i386 uaccess to fixmap pages
Linus Torvalds wrote:

> So we'd have to move the kernel to something like
> 0xc0400000 (and preferably higher, to make sure there is a nice hole in
> between - say 0xc1000000), which in turn has a cost of verifying that
> nothing assumes the current lay-out (we've had the 1/2/3GB TASK_SIZE
> patches floating around, but they've never had "odd sizes").


#define ptr_ok(x) ((x) > 0xc0000000 && (x) < 0xc1000000)
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