linux-kernel - Re: [PATCH 5/6 v5] CPU probe/release files

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Date:	Fri, 18 Dec 2009 10:24:51 -0600
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	Andreas Schwab <schwab@...ux-m68k.org>
CC:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6 v5] CPU probe/release files

Andreas Schwab wrote:
> Nathan Fontenot <nfont@...tin.ibm.com> writes:
> 
>> Index: powerpc/arch/powerpc/Kconfig
>> ===================================================================
>> --- powerpc.orig/arch/powerpc/Kconfig	2009-10-28 15:21:47.000000000 -0500
>> +++ powerpc/arch/powerpc/Kconfig	2009-10-28 15:21:53.000000000 -0500
>> @@ -320,6 +320,10 @@
>>  
>>  	  Say N if you are unsure.
>>  
>> +config ARCH_CPU_PROBE_RELEASE
>> +	def_bool y
>> +	depends on HOTPLUG_CPU
>> +
> 
> That does not work.
> 
> drivers/built-in.o: In function `.store_online':
> cpu.c:(.ref.text+0xf5c): undefined reference to `.cpu_hotplug_driver_lock'
> cpu.c:(.ref.text+0xfc8): undefined reference to `.cpu_hotplug_driver_unlock'
> make: *** [.tmp_vmlinux1] Error 1
> 
> cpu_hotplug_driver_lock is only defined on pseries, but HOTPLUG_CPU is
> also defined on pmac.

These two routines should be defined as a no-op if CONFIG_ARCH_CPU_PROBE_RELEASE
is not defined in linux/cpu.h.  The update below should be in the patch set
you are looking at. 

from linux/cpu.h:

#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
extern void cpu_hotplug_driver_lock(void);
extern void cpu_hotplug_driver_unlock(void);
#else
static inline void cpu_hotplug_driver_lock(void)
{
}

static inline void cpu_hotplug_driver_unlock(void)
{
}
#endif

-Nathan Fontenot
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