linux-kernel - linux-next: build failure after merge of the final tree

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Date:	Fri, 20 May 2011 16:12:10 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	David Miller <davem@...emloft.net>,
	Linus <torvalds@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: linux-next: build failure after merge of the final tree

Hi all,

After merging the final tree, today's linux-next build (sparc32 defconfig)
failed like this:

In file included from include/linux/seqlock.h:29,
                 from include/linux/time.h:8,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:57,
                 from arch/sparc/kernel/asm-offsets.c:13:
include/linux/spinlock.h: In function 'spin_unlock_wait':
include/linux/spinlock.h:360: error: implicit declaration of function 'cpu_relax'

Probably the victim of some include changing ... I think it was due to
commit e66eed651fd1 ("list: remove prefetching from regular list
iterators").

I added the following patch for today (this may not be the best solution):

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Fri, 20 May 2011 15:48:17 +1000
Subject: [PATCH] spinlock_up.h: include asm/processor.h in for cpu_relax

Commit e66eed651fd1 ("list: remove prefetching from regular list
iterators") removed the include of prefetch.h from list.h and this was
a path to including asm/processor.h.  We need to include it excplicitly
now.

Fixes this build error on sparc32 (at least):

In file included from include/linux/seqlock.h:29,
                 from include/linux/time.h:8,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:57,
                 from arch/sparc/kernel/asm-offsets.c:13:
include/linux/spinlock.h: In function 'spin_unlock_wait':
include/linux/spinlock.h:360: error: implicit declaration of function 'cpu_relax

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/spinlock_up.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/spinlock_up.h b/include/linux/spinlock_up.h
index b14f6a9..a26e2fb 100644
--- a/include/linux/spinlock_up.h
+++ b/include/linux/spinlock_up.h
@@ -5,6 +5,8 @@
 # error "please don't include this file directly"
 #endif
 
+#include <asm/processor.h>	/* for cpu_relax() */
+
 /*
  * include/linux/spinlock_up.h - UP-debug version of spinlocks.
  *
-- 
1.7.5.1

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/
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