From: "H. Peter Anvin" <hpa@zytor.com>
To: Keith Owens <kaos@ocs.com.au>
Cc: Trent Piepho <xyzzy@speakeasy.org>,
Al Viro <viro@ftp.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH][RFC] getting rid of stupid loop in BUG()
Date: Tue, 24 Jul 2007 22:09:24 -0700 [thread overview]
Message-ID: <46A6DB04.3000003@zytor.com> (raw)
In-Reply-To: <21803.1185331847@ocs10w.ocs.com.au>
Keith Owens wrote:
> Trent Piepho (on Tue, 24 Jul 2007 19:31:36 -0700 (PDT)) wrote:
>> Adding __builtin_trap after the
>> asm might be an ok fix. It will emit a spurious int 6, but that won't even be
>> reached since the asm doesn't return, and it probably be less extra code than
>> the loop.
>
> int 6 is a two byte instruction, the loop generates jmp with an 8 bit
> offset, also two bytes. No change in code size.
>
INT 6 is #UD, so the __builtin_trap() replaces the ud2a as well as the loop.
How far back was __builtin_trap() supported?
-hpa
next prev parent reply other threads:[~2007-07-25 5:14 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 15:39 [PATCH][RFC] getting rid of stupid loop in BUG() Al Viro
2007-07-24 16:56 ` Jeremy Fitzhardinge
2007-07-24 17:03 ` H. Peter Anvin
2007-07-24 17:14 ` Al Viro
2007-07-24 17:28 ` H. Peter Anvin
2007-07-24 18:58 ` Jeremy Fitzhardinge
2007-07-24 19:01 ` H. Peter Anvin
2007-07-24 19:13 ` Jeremy Fitzhardinge
2007-07-24 20:04 ` Al Viro
2007-07-24 21:14 ` Jeremy Fitzhardinge
2007-07-25 2:31 ` Trent Piepho
2007-07-25 2:50 ` Keith Owens
2007-07-25 5:09 ` H. Peter Anvin [this message]
2007-07-25 6:24 ` Jeremy Fitzhardinge
2007-07-25 6:29 ` David Miller
2007-07-25 6:50 ` Heiko Carstens
2007-07-25 16:56 ` Linus Torvalds
2007-07-25 17:00 ` Jeremy Fitzhardinge
2007-07-25 17:03 ` H. Peter Anvin
2007-07-25 17:19 ` Linus Torvalds
2007-07-25 17:25 ` Al Viro
2007-07-25 17:36 ` Jeremy Fitzhardinge
2007-07-25 19:35 ` David Miller
2007-07-25 20:26 ` H. Peter Anvin
2007-07-25 19:28 ` David Miller
2007-07-25 17:19 ` Al Viro
2007-07-25 17:22 ` H. Peter Anvin
2007-07-25 17:26 ` Al Viro
2007-07-25 17:35 ` David Howells
2007-07-25 17:41 ` Jeremy Fitzhardinge
2007-07-25 20:29 ` Chuck Ebbert
2007-07-25 20:37 ` H. Peter Anvin
2007-07-25 22:01 ` David Miller
2007-07-25 18:24 ` Linus Torvalds
2007-07-25 17:36 ` Al Viro
2007-07-25 17:44 ` Jeremy Fitzhardinge
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