linux-kernel - Re: x86 arch updates also broke s390

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Message-Id: <1201859653.27899.2.camel@localhost>
Date:	Fri, 01 Feb 2008 10:54:13 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Nick Piggin <npiggin@...e.de>,
	heiko.carstens@...ibm.com, linux390@...ibm.com
Subject: Re: x86 arch updates also broke s390

On Fri, 2008-02-01 at 10:48 +0100, Ingo Molnar wrote:
> > Defining GENERIC_LOCKBREAK in arch/s390/Kconfig takes care of it.
> I'll 
> > cook up a patch and queue it in git390.
> 
> the one below should do the trick.

Thanks but I already queued a different one (see below). The other
architectures that define GENERIC_LOCKBREAK have the "depends on SMP &&
PREEMPT" line as well. The line does make sense if you look at the way
how spin_is_contended is used, no ?

-- 
blue skies,
  Martin.

"Reality continues to ruin my life." - Calvin.

---
Subject: [PATCH] Define GENERIC_LOCKBREAK.

From: Martin Schwidefsky <schwidefsky@...ibm.com>

Fix compile error:

  CC      arch/s390/kernel/asm-offsets.s
In file included from 
arch/s390/kernel/asm-offsets.c:7:
include/linux/sched.h: In function 'spin_needbreak':
include/linux/sched.h:1931: error: implicit declaration of function
'__raw_spin_is_contended'
make[2]: *** [arch/s390/kernel/asm-offsets.s] Error 1

Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---

 arch/s390/Kconfig |    5 +++++
 1 file changed, 5 insertions(+)

diff -urpN linux-2.6/arch/s390/Kconfig
linux-2.6-patched/arch/s390/Kconfig
--- linux-2.6/arch/s390/Kconfig	2008-01-31 13:57:33.000000000 +0100
+++ linux-2.6-patched/arch/s390/Kconfig	2008-01-31 13:57:42.000000000
+0100
@@ -47,6 +47,11 @@ config NO_IOMEM
 config NO_DMA
 	def_bool y
 
+config GENERIC_LOCKBREAK
+	bool
+	default y
+	depends on SMP && PREEMPT
+
 mainmenu "Linux Kernel Configuration"
 
 config S390


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