linux-kernel - Re: Oops with DCACHE_WORD

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Message-ID: <4FA2CE5C.8000100@zytor.com>
Date:	Thu, 03 May 2012 11:28:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Al Viro <viro@...iv.linux.org.uk>, Nick Piggin <npiggin@...il.com>,
	Jana Saout <jana@...ut.de>, Joel Becker <jlbec@...lplan.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Oops with DCACHE_WORD_ACCESS and ocfs2, autofs4

+		"lea" __WORDSUFFIX " %2,%1\n\t"
+		"and" __WORDSUFFIX " %4,%1\n\t"
+		"shl" __WORDSUFFIX " $3,%1\n\t"
+		"shr" __WORDSUFFIX " %b1,%0\n\t"

Also, for this sequence of instructions using %ecx unconditionally is
actually better (avoids REX prefixes on 64 bits.)

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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