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SubjectRe: objtool clac/stac handling change..
On Thu, Jul 02, 2020 at 02:55:19PM -0700, Linus Torvalds wrote:

> And while XSTATE_OP() is still disgusting, it's
> (a) slightly less disgusting than it used to be
> (b) now easily fixable if we do the "exceptions clear AC" thing.
> so it's an improvement all around.
> If it works, that is. As mentioned: IT HAS NO TESTING.

What about load_unaligned_zeropad()? Normally the caller doesn't
want to know about the exception on crossing into an unmapped
page. Blanket "clear #AC of fixup, don't go through user_access_end()
in case of exception" would complicate the code that calls that sucker.

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