linux-kernel - Re: [RFC][PATCH] rip out x86

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Date:	Thu, 31 Jan 2013 14:03:12 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] rip out x86_32 NUMA remapping code

On 01/31/2013 02:01 PM, Yinghai Lu wrote:
> On Thu, Jan 31, 2013 at 1:59 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 01/31/2013 01:55 PM, Yinghai Lu wrote:
>>> On Thu, Jan 31, 2013 at 1:51 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>>> I get a build failure on i386 allyesconfig with this patch:
>>>>
>>>> arch/x86/power/built-in.o: In function `swsusp_arch_resume':
>>>> (.text+0x14e4): undefined reference to `resume_map_numa_kva'
>>>>
>>>> It looks trivial to fix up; I assume resume_map_numa_kva() just goes
>>>> away like it does in the non-NUMA case, but it would be nice if you
>>>> could confirm that.
>>>
>>> the patches does not seem to complete.
>>>
>>> at least, it does not remove
>>>
>>> arch/x86/mm/numa.c:     nd = alloc_remap(nid, nd_size);
>>>
>>
>> ... which will just return NULL because alloc_remap turns into an inline
>> just returning NULL.  So the compiled code is correct, but the source
>> code is needlessly messy.
> 
> yes...
> 
> It still left #ifdefCONFIG_HAVE_ARCH_ALLOC_REMAP there.
> 
> #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
> extern void *alloc_remap(int nid, unsigned long size);
> #else
> static inline void *alloc_remap(int nid, unsigned long size)
> {
>         return NULL;
> }
> #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
> 
> should throw them all away.
> 

That is arch-independent code, and the tile architecture still uses it.

Makes one wonder how much it will get tested going forward, especially
with the x86-32 implementation clearly lacking in that department.

	-hpa

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