linux-kernel - Re: 2.6.24-rc6-mm1: __raw_spin_is

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Date:	Thu, 27 Dec 2007 06:21:57 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc6-mm1: __raw_spin_is_contended undefined

On Wed, Dec 26, 2007 at 09:21:58PM -0500, Joseph Fannin wrote:
> On Sat, Dec 22, 2007 at 11:30:56PM -0800, Andrew Morton wrote:
> >
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc6/2.6.24-rc6-mm1/
> >
> 
> This doesn't build on powerpc with my .config:
> 
> In file included from arch/powerpc/kernel/asm-offsets.c:17:
> include/linux/sched.h: In function ???spin_needbreak???:
> include/linux/sched.h:1947: error: implicit declaration of function ???__raw_spin_is_contended???
> 
> I don't see where __raw_spin_is_contended is defined for any arch
> other than x86, so I guess this will happen on any non-x86 arch when
> SMP=y and PREEMPT=y are set?

And CONFIG_GENERIC_LOCKBREAK is not defined, which is what powerpc needs.

Thanks for reporting,
Nick

---

Index: linux-2.6/arch/powerpc/Kconfig
===================================================================
--- linux-2.6.orig/arch/powerpc/Kconfig
+++ linux-2.6/arch/powerpc/Kconfig
@@ -53,6 +53,11 @@ config RWSEM_XCHGADD_ALGORITHM
 	bool
 	default y
 
+config GENERIC_LOCKBREAK
+	bool
+	default y
+	depends on SMP && PREEMPT
+
 config ARCH_HAS_ILOG2_U32
 	bool
 	default y
--
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