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From: David Rientjes <rientjes@cs.washington.edu>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Adrian Bunk <bunk@stusta.de>,
	Alistair John Strachan <s0348365@sms.ed.ac.uk>,
	"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
	LKML <linux-kernel@vger.kernel.org>, Greg KH <greg@kroah.com>,
	Chuck Ebbert <76306.1226@compuserve.com>,
	Andrew Morton <akpm@osdl.org>
Subject: Re: kernel + gcc 4.1 = several problems
Date: Tue, 2 Jan 2007 15:09:39 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64N.0701021500480.6449@attu4.cs.washington.edu> (raw)
In-Reply-To: <Pine.LNX.4.64.0701021349420.4473@woody.osdl.org>

On Tue, 2 Jan 2007, Linus Torvalds wrote:

> Traditionally, afaik, -Os has tended to show compiler problems that 
> _could_ happen with -O2 too, but never do in practice. It may be that 
> gcc-4.1 without -Os miscompiles some very unusual code, and then with -Os 
> we just hit more cases of that.
> 

gcc optimizations were almost completely rewritten between 3.4.6 and 4.1, 
and one of the subtle changes that may have been introduced is with regard 
to the heuristics used to determine whether to inline an 'inline' function 
or not when using -Os.  This problem can show up in dynamic linking and 
break on certain architectures but should be detectable by using -Winline.

		David

  reply	other threads:[~2007-01-02 23:13 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-20 14:21 Oops in 2.6.19.1 Alistair John Strachan
2006-12-20 16:30 ` Greg KH
2006-12-20 16:44   ` Alistair John Strachan
2006-12-23 15:40 ` Alistair John Strachan
2006-12-27  2:07   ` Zhang, Yanmin
2006-12-27 12:35     ` Alistair John Strachan
2006-12-28  2:41       ` Zhang, Yanmin
2006-12-28  4:02         ` Alistair John Strachan
2006-12-28  4:14           ` Alistair John Strachan
2006-12-30 16:59             ` Alistair John Strachan
2006-12-31 13:47               ` Alistair John Strachan
2006-12-31 16:27               ` Adrian Bunk
2006-12-31 16:55                 ` Alistair John Strachan
2007-01-02 21:10                   ` kernel + gcc 4.1 = several problems Adrian Bunk
2007-01-02 21:56                     ` Alistair John Strachan
2007-01-02 22:06                       ` D. Hazelton
2007-01-02 23:24                         ` Adrian Bunk
2007-01-02 23:41                           ` D. Hazelton
2007-01-03  2:05                             ` Horst H. von Brand
2007-01-02 22:13                       ` Linus Torvalds
2007-01-02 23:18                         ` Alistair John Strachan
2007-01-03  1:43                           ` Linus Torvalds
2007-01-02 22:01                     ` Linus Torvalds
2007-01-02 23:09                       ` David Rientjes [this message]
2007-01-03  2:12 Mikael Pettersson
2007-01-03  2:20 ` Alistair John Strachan
2007-01-05 15:53   ` Alistair John Strachan
2007-01-05 16:02     ` Linus Torvalds
2007-01-05 16:19       ` Alistair John Strachan
2007-01-05 16:49         ` Linus Torvalds
2007-01-07  0:36           ` Pavel Machek
2007-01-07  0:57             ` Alistair John Strachan
2007-01-03  5:55 ` Willy Tarreau
2007-01-03 10:29 ` Alan
2007-01-03 10:32   ` Grzegorz Kulewski
2007-01-03 11:51     ` Jeff Garzik
2007-01-03 12:44     ` Alan
2007-01-03 13:32       ` Arjan van de Ven
2007-01-03 13:58         ` Jakub Jelinek
2007-01-03 14:28         ` Alan
2007-01-03 16:06           ` Linus Torvalds
2007-01-03 16:03     ` Linus Torvalds
2007-01-03 17:01       ` l.genoni
2007-01-03 17:45         ` Tim Schmielau
2007-01-03 20:24           ` Linus Torvalds
2007-01-03 17:06       ` l.genoni
2007-01-03 17:53       ` Mariusz Kozlowski
2007-01-03 19:47       ` Denis Vlasenko
2007-01-03 20:38         ` Linus Torvalds
2007-01-03 21:48           ` Denis Vlasenko
2007-01-03 22:13             ` Linus Torvalds
2007-01-03 21:44       ` Thomas Sailer
2007-01-03 22:08         ` Linus Torvalds
2007-01-04  3:08       ` Zou, Nanhai
2007-01-04 15:34         ` Linus Torvalds
2007-01-04  7:11 Albert Cahalan
2007-01-04 16:43 ` Segher Boessenkool
2007-01-04 17:04   ` Albert Cahalan
2007-01-04 17:24     ` Segher Boessenkool
2007-01-04 17:47       ` Linus Torvalds
2007-01-04 18:53         ` Segher Boessenkool
2007-01-04 19:10         ` Al Viro
2007-01-05 17:17       ` Pavel Machek
2007-01-06  8:23         ` Segher Boessenkool
2007-01-04 17:37     ` Linus Torvalds
2007-01-04 18:34       ` Segher Boessenkool
2007-01-04 22:02         ` Geert Bosch
2007-01-07  4:25       ` Denis Vlasenko
2007-01-07  4:45         ` Linus Torvalds
2007-01-07  5:26           ` Jeff Garzik
2007-01-07 15:10         ` Segher Boessenkool
2007-01-26 22:05           ` Michael K. Edwards
2007-01-04 18:08     ` Andreas Schwab

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