From: Andrew Morton <akpm@linux-foundation.org>
Cc: cl@linux-foundation.org, andi@firstfloor.org,
rusty@rustcorp.com.au, sfr@canb.auug.org.au,
linux-next@vger.kernel.org, travis@sgi.com, mingo@elte.hu,
rth@twiddle.net
Subject: Re: linux-next: manual merge of the rr tree
Date: Thu, 8 Jan 2009 12:50:31 -0800 [thread overview]
Message-ID: <20090108125031.5d27e069.akpm@linux-foundation.org> (raw)
In-Reply-To: <20090108204835.GI496@one.firstfloor.org>
On Thu, 8 Jan 2009 21:48:35 +0100
Andi Kleen <andi@firstfloor.org> wrote:
> +/*
> + * This macro obfuscates arithmetic on a variable address so that gcc
> + * shouldn't recognize the original var, and make assumptions about it.
> + *
> + * This is needed because the C standard makes it undefined to do
> + * pointer arithmetic on "objects" outside their boundaries and the
> + * gcc optimizers assume this is the case. In particular they
> + * assume such arithmetic does not wrap.
> + *
> + * A miscompilation has been observed because of this on PPC.
> + * To work around it we hide the relationship of the pointer and the object
> + * using this macro.
> + *
wow, thanks. I always wondered.
next prev parent reply other threads:[~2009-01-08 20:50 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-05 3:32 linux-next: manual merge of the rr tree Stephen Rothwell
2009-01-05 6:57 ` Rusty Russell
2009-01-05 12:47 ` Ingo Molnar
2009-01-06 8:51 ` Rusty Russell
2009-01-06 9:20 ` Ingo Molnar
2009-01-06 13:13 ` Mike Travis
2009-01-06 13:19 ` Ingo Molnar
2009-01-06 14:21 ` Mike Travis
2009-01-06 14:59 ` Ingo Molnar
2009-01-07 2:46 ` Rusty Russell
2009-01-05 15:29 ` Christoph Lameter
2009-01-06 1:04 ` Rusty Russell
2009-01-06 15:05 ` Christoph Lameter
2009-01-07 2:47 ` Rusty Russell
2009-01-07 16:11 ` Christoph Lameter
2009-01-07 17:20 ` Andi Kleen
2009-01-07 19:01 ` Christoph Lameter
2009-01-08 20:48 ` Andi Kleen
2009-01-08 20:50 ` Andrew Morton [this message]
2009-01-08 21:15 ` Christoph Lameter
2009-01-08 21:49 ` Andi Kleen
2009-01-08 22:21 ` Christoph Lameter
2009-01-08 22:25 ` David Miller
2009-01-09 14:42 ` Christoph Lameter
2009-01-09 22:54 ` David Miller
2009-01-05 19:46 ` Mike Travis
2009-01-05 8:41 ` Rusty Russell
2009-01-06 3:46 ` Stephen Rothwell
2009-01-06 13:26 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2009-01-09 1:53 Stephen Rothwell
2009-01-09 1:53 ` Stephen Rothwell
2009-01-06 3:11 Stephen Rothwell
2008-12-29 7:51 Stephen Rothwell
2008-12-29 7:47 Stephen Rothwell
2008-12-29 8:02 ` Stephen Rothwell
2008-12-22 6:32 Stephen Rothwell
2008-12-22 7:58 ` Rusty Russell
2008-12-22 8:45 ` Mark McLoughlin
2009-01-04 23:30 ` Stephen Rothwell
2009-01-05 4:36 ` Greg KH
2009-01-05 5:56 ` Stephen Rothwell
2008-12-16 5:29 Stephen Rothwell
2008-12-15 6:15 Stephen Rothwell
2008-11-24 3:20 Stephen Rothwell
2008-11-20 3:24 Stephen Rothwell
2008-11-20 4:28 ` Rusty Russell
2008-11-14 4:13 Stephen Rothwell
2008-11-14 4:20 ` Stephen Rothwell
2008-11-14 4:30 ` David Miller
2008-11-14 4:36 ` Stephen Rothwell
2008-11-14 4:41 ` David Miller
2008-11-14 5:06 ` Stephen Rothwell
2008-11-14 6:42 ` David Miller
2008-11-15 22:32 ` Rusty Russell
2008-11-17 2:57 ` David Miller
2008-11-07 5:01 Stephen Rothwell
2008-10-29 4:28 Stephen Rothwell
2008-10-29 4:33 ` Stephen Rothwell
2008-10-29 22:42 ` Rusty Russell
2008-10-28 2:55 Stephen Rothwell
2008-10-28 7:19 ` Heiko Carstens
2008-10-28 7:24 ` Stephen Rothwell
2008-10-27 3:32 Stephen Rothwell
2008-10-24 2:21 Stephen Rothwell
2008-10-23 4:12 Stephen Rothwell
2008-10-23 5:16 ` Rusty Russell
2008-10-23 12:26 ` Rusty Russell
2008-10-23 12:50 ` Mike Travis
2008-10-23 4:01 Stephen Rothwell
2008-10-23 7:17 ` Peter Zijlstra
2008-10-23 13:32 ` Rusty Russell
2008-10-23 3:56 Stephen Rothwell
2008-10-23 12:25 ` Rusty Russell
2008-09-12 21:53 Stephen Rothwell
2008-07-28 3:16 Stephen Rothwell
2008-07-28 3:13 Stephen Rothwell
2008-07-28 3:09 Stephen Rothwell
2008-07-22 4:58 Stephen Rothwell
2008-07-22 14:21 ` Mike Travis
2008-07-16 8:15 Stephen Rothwell
2008-07-17 5:46 ` Max Krasnyansky
2008-07-18 4:31 ` Rusty Russell
2008-07-14 6:52 Stephen Rothwell
2008-07-03 5:03 Stephen Rothwell
2008-07-03 5:56 ` Ingo Molnar
2008-07-03 8:07 ` Stephen Rothwell
2008-07-03 8:19 ` Ingo Molnar
2008-07-04 0:45 ` Rusty Russell
2008-07-04 0:29 ` Rusty Russell
2008-06-25 6:27 Stephen Rothwell
2008-06-25 6:38 ` Christian Borntraeger
2008-06-25 15:23 ` Stephen Rothwell
2008-06-25 6:27 Stephen Rothwell
2008-06-25 7:47 ` Ingo Molnar
2008-06-25 8:33 ` Rusty Russell
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