linux-kernel - Re: [PATCH 1/1] cpumask: Change cpumask_of_cpu to use cpumask_of_cpu_map

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Message-ID: <4890E539.6060905@am.sony.com>
Date:	Wed, 30 Jul 2008 15:03:37 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Mike Travis <travis@....com>
CC:	Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
	Lennert Buytenhek <kernel@...tstofly.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Paul Jackson <pj@....com>, Tony Luck <tony.luck@...el.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Robert Richter <robert.richter@....com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Sam Creasey <sammy@...my.net>, Greg Banks <gnb@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Adrian Bunk <bunk@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andreas Schwab <schwab@...e.de>,
	Johannes Weiner <hannes@...urebad.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 1/1] cpumask: Change cpumask_of_cpu to use cpumask_of_cpu_map
 - build breakage

Mike Travis wrote:
> There was a later update that fixed this.  You should have the following
> in include/linux/cpumask.h particularly line 291.
> 
> 
> e56b3bc7 (Linus Torvalds         2008-07-28 11:32:33 -0700 285) /*
> e56b3bc7 (Linus Torvalds         2008-07-28 11:32:33 -0700 286)  * In cases where we take the address of the cpumask immediately,
> e56b3bc7 (Linus Torvalds         2008-07-28 11:32:33 -0700 287)  * gcc optimizes it out (it's a constant) and there's no huge stack
> e56b3bc7 (Linus Torvalds         2008-07-28 11:32:33 -0700 288)  * variable created:
> e56b3bc7 (Linus Torvalds         2008-07-28 11:32:33 -0700 289)  */
> 1eddd657 (Stephen Rothwell       2008-07-29 16:07:37 +1000 290) #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
> ^1da177e (Linus Torvalds         2005-04-16 15:20:36 -0700 291)
> 
> If 1eddd657 is there, would you send the config?

I was working out of a linux-2.6.27-rc1.tar.bz2 I got off of kernel.org,
so my working tree doesn't have the commit information.


However, comparing my source with the source above shows a difference.
In a Linus' 2.6 tree I downloaded outside my firewall, I have the following:
3dd730f2        (Stephen Rothwell       2008-07-29 16:07:37 +1000       290)#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))

It doesn't appear to have the change you mention.  But 3dd730f2 looks
promising:
commit 3dd730f2b49f101b90d283c3efc4e6cd826dd8f6
Author: Stephen Rothwell <sfr@...b.auug.org.au>
Date:   Tue Jul 29 16:07:37 2008 +1000

    cpumask: statement expressions confuse some versions of gcc

    when you take the address of the result.  Noticed on a sparc64 compile
    using a version 3.4.5 cross compiler.

     kernel/time/tick-common.c: In function `tick_check_new_device':
     kernel/time/tick-common.c:210: error: invalid lvalue in unary `&'
     ...

    Just make it a regular expression.

    Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
    Acked-by: Ingo Molnar <mingo@...e.hu>
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

This looks like it's only 4 hours old.  I'll give this a spin.

I don't see 1eddd657 anywhere in the commit log for cpumask.h
Is it in linux-next?

Thanks,
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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