From: Jiri Slaby <jirislaby@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
x86@kernel.org
Subject: Re: [PATCH 1/1] X86: use explicit register name for get/put_user
Date: Wed, 09 Dec 2009 21:03:43 +0100 [thread overview]
Message-ID: <4B20029F.90405@gmail.com> (raw)
In-Reply-To: <4B1D4B0C.9030108@zytor.com>
On 12/07/2009 07:35 PM, H. Peter Anvin wrote:
> On 12/07/2009 04:37 AM, Jiri Slaby wrote:
>> In the document they write only about the "same location" occupied by in
>> and out, nothing is said about size (and hence I think we cannot
>> mismatch size of operands). And I couldn't find any other
>> restrictions/documentation about inline assembly, hence the patch,
>> because nothing assured me this cannot change in the future.
>
> There is almost no documentation at all; some of the little
> documentation there is is in comments in the source code. To a first
> order of approximation, asm() is defined by behavior, not by a written
> spec. Trying to play language lawyer with the little bit that is
> written down is pointless -- the gcc people have been more than happy to
> break asm() between releases regardless of what is and is not written down.
Ok, thanks for the explanation.
--
js
prev parent reply other threads:[~2009-12-09 20:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-06 9:30 [PATCH 1/1] X86: use explicit register name for get/put_user Jiri Slaby
2009-12-06 19:11 ` H. Peter Anvin
2009-12-07 12:37 ` Jiri Slaby
2009-12-07 18:35 ` H. Peter Anvin
2009-12-09 20:03 ` Jiri Slaby [this message]
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