linux-kernel - Re: [PATCH 1/3] X86: Optimise fls(), ffs() and fls64()

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Message-ID: <17213.1271245760@redhat.com>
Date:	Wed, 14 Apr 2010 12:49:20 +0100
From:	David Howells <dhowells@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>
Cc:	dhowells@...hat.com, Ralf Baechle <ralf@...ux-mips.org>,
	mingo@...e.hu, tglx@...utronix.de, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] X86: Optimise fls(), ffs() and fls64()

Matthew Wilcox <matthew@....cx> wrote:

> I don't know whether we can get it /documented/, but the architect I
> asked said "We'll never get away with reverting to the older behavior,
> so in essence the architecture is set to not overwrite."

Does that mean we can rely on it?  Linus?

David
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