linux-kernel - linux-next: build failure

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Message-Id: <20080729162300.733b3e09.sfr@canb.auug.org.au>
Date:	Tue, 29 Jul 2008 16:23:00 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus <torvalds@...ux-foundation.org>,
	Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>
Subject: linux-next: build failure

Hi Dave,

Today's linux-next build (sparc64 defconfig) failed like this:

kernel/time/tick-common.c: In function `tick_check_new_device':
kernel/time/tick-common.c:210: error: invalid lvalue in unary `&'
kernel/time/tick-common.c:223: error: invalid lvalue in unary `&'
kernel/time/tick-common.c:255: error: invalid lvalue in unary `&'

gcc is version 3.4.5 sparc64 cross compiler (powercp64 host).

The below patch fixes it.
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Tue, 29 Jul 2008 16:07:37 +1000
Subject: [PATCH] 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 `&'
kernel/time/tick-common.c:223: error: invalid lvalue in unary `&'
kernel/time/tick-common.c:255: error: invalid lvalue in unary `&'

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/cpumask.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 96d0509..d3219d7 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -287,7 +287,7 @@ static inline const cpumask_t *get_cpu_mask(unsigned int cpu)
  * gcc optimizes it out (it's a constant) and there's no huge stack
  * variable created:
  */
-#define cpumask_of_cpu(cpu) ({ *get_cpu_mask(cpu); })
+#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
 
 
 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
-- 
1.5.6.3

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