linux-kernel - RE: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D41116CA6@AcuExch.aculab.com>
Date:	Mon, 7 Mar 2016 17:27:14 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	"'sedat.dilek@...il.com'" <sedat.dilek@...il.com>,
	Jiri Kosina <jikos@...nel.org>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Andy Lutomirski <luto@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: RE: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

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