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SubjectRe: [PATCH] x86: Enable fast 32-bit put_user_64 for copy_to_user

* Chris Wilson <> wrote:

> For fixed sized copies, copy_to_user() will utilize __put_user_size
> fastpaths. However, it is missing the translation for 64bit copies on
> x86/32. Testing on a Pinetrail Atom, the 64 bit put_user fastpath is
> substantially faster than the generic copy_to_user() fallback.
> Cc: Thomas Gleixner <>
> Cc: Ingo Molnar <>
> Cc: "H. Peter Anvin" <>
> Cc:
> CC:

The patch makes sense, but your Signed-off-by line is missing.



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