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From: David Laight <David.Laight@ACULAB.COM>
To: "'sedat.dilek@gmail.com'" <sedat.dilek@gmail.com>,
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CC: Alan Stern <stern@rowland.harvard.edu>,
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Subject: RE: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning
Thread-Topic: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning
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Date: Mon, 7 Mar 2016 17:27:14 +0000
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From: Sedat Dilek
...
> Did someone look at the next/follow-ups in this thread?
> For example: D6629 "x86: Emit LAHF/SAHF instead of PUSHF/POPF" [2]?

LAHF and SAHF come with the following note:

This instruction executes as described above in compatibility mode and legacy mode.
It is valid in 64-bit mode only if CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1.

So I suspect they can't be used.

	David