From: Avi Kivity <avi@redhat.com>
To: David Howells <dhowells@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Matthew Wilcox <matthew@wil.cx>,
Ralf Baechle <ralf@linux-mips.org>,
mingo@elte.hu, tglx@linutronix.de, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] X86: Optimise fls(), ffs() and fls64()
Date: Wed, 14 Apr 2010 17:30:50 +0300 [thread overview]
Message-ID: <4BC5D19A.8000605@redhat.com> (raw)
In-Reply-To: <17213.1271245760@redhat.com>
On 04/14/2010 02:49 PM, David Howells wrote:
> Matthew Wilcox<matthew@wil.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?
>
Even if Intel processors behave that way, other processors (real and
emulated) use those manuals as a specification. Emulated processors are
unlikely to touch an undefined register, but real processors may.
(qemu tcg appears not to touch the output)
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-04-14 14:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-26 14:42 [PATCH 1/3] X86: Optimise fls(), ffs() and fls64() David Howells
2010-03-26 14:42 ` [PATCH 2/3] Adjust the comment on get_order() to describe the size==0 case David Howells
2010-03-26 14:42 ` [PATCH 3/3] Optimise get_order() David Howells
2010-03-26 17:23 ` [PATCH 1/3] X86: Optimise fls(), ffs() and fls64() Linus Torvalds
2010-03-26 17:37 ` Scott Lurndal
2010-03-26 17:42 ` Linus Torvalds
2010-04-06 13:57 ` Jamie Lokier
2010-04-06 14:40 ` Linus Torvalds
2010-03-26 17:42 ` David Howells
2010-03-26 17:45 ` Linus Torvalds
2010-03-26 17:58 ` Ralf Baechle
2010-03-26 18:03 ` Linus Torvalds
2010-03-26 18:16 ` Matthew Wilcox
2010-04-06 13:30 ` Matthew Wilcox
2010-04-14 11:49 ` David Howells
2010-04-14 14:30 ` Avi Kivity [this message]
2010-04-15 8:48 ` David Howells
2010-04-15 8:49 ` Avi Kivity
2010-04-15 11:41 ` Jamie Lokier
2010-03-26 17:52 ` Matthew Wilcox
[not found] ` <4BACCB4E.7010108@draigBrady.com>
2010-04-14 13:13 ` David Howells
-- strict thread matches above, loose matches on Subject: below --
2010-01-13 19:39 David Howells
2010-01-13 20:15 ` Geert Uytterhoeven
2010-01-13 21:59 ` David Howells
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