> But it would be a neat feature nevertheless, unfortunately exporting 4MB
> pages to ring 3 user-space doesnt seem to work (i've tried), only ring 0
> is supposed to see those mappings.
The VM layer currently gets confused if it sees a 4MB page.
I actually had 4MB pages working at one point (with magic hackery to the
pmd_xxx macros - no generic VM changes necessary), but it became fairly
ugly, and the generated code was nasty for the normal case of 4kB pages.
Linus
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