linux-kernel - Re: [PATCH 1/2] topology: Check for missing CPU devices

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Date:	Mon, 09 Jan 2012 15:19:43 +0100
From:	Richard Weinberger <richard@....at>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Thorsten Glaser <tg@...bsd.de>,
	Debian kernel team <debian-kernel@...ts.debian.org>,
	linux-m68k@...r.kernel.org, debian-68k@...ts.debian.org
Subject: Re: [PATCH 1/2] topology: Check for missing CPU devices

Am 09.01.2012 03:52, schrieb Ben Hutchings:
> On Sun, 2012-01-08 at 17:29 -0800, Linus Torvalds wrote:
>> On Sun, Jan 8, 2012 at 5:06 PM, richard -rw- weinberger
>> <richard.weinberger@...il.com> wrote:
>>> On Mon, Jan 9, 2012 at 1:18 AM, Linus Torvalds
>>> <torvalds@...ux-foundation.org> wrote:
>>>> Ok, both of the patches look sane to me, but it would really be nice
>>>> to hear from somebody with the actual affected architectures, and get
>>>> a tested-by.
>>>
>>> UML is affected:
>>> https://lkml.org/lkml/2012/1/8/186
>>>
>>> I wasted an hour finding out why it is crashing.
>>> Instead of testing kernels I really should read more LKML. ;-)
>>
>> Hmm.
>>
>> Ben - how about that
>>
>>   static DEFINE_PER_CPU(struct cpu, cpu_devices);
>>
>> approach that Richard uses in his patch, instead of the kcalloc?
> 
> That seems perfectly good.
> 
>> And
>> clearly UM should also do that CONFIG_GENERIC_CPU_DEVICES thing with
>> your patch.
>>
>> Richard - does Ben's patch work for  you too if you just add "select
>> GENERIC_CPU_DEVICES" in the UM Kconfig too (Kconfig.common, probably)?
> 

Yeah, Ben's patch solves the problem too. :-)
Ben, please add the attached patch snippet to your patch.

--

diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index a923483..b37ae70 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -8,6 +8,7 @@ config UML
 	default y
 	select HAVE_GENERIC_HARDIRQS
 	select GENERIC_IRQ_SHOW
+	select GENERIC_CPU_DEVICES

 config MMU
 	bool


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