linux-kernel - Re: [PATCH 28/46] x86, mm: Add pointer about Xen mmu requirement for alloc_low

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Message-ID: <50A289BB.5030009@zytor.com>
Date:	Tue, 13 Nov 2012 09:56:11 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Jacob Shin <jacob.shin@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 28/46] x86, mm: Add pointer about Xen mmu requirement
 for alloc_low_pages

On 11/13/2012 08:38 AM, Stefano Stabellini wrote:
> On Mon, 12 Nov 2012, Yinghai Lu wrote:
>> From: Stefano Stabellini <stefano.stabellini@...citrix.com>
>>
>> Add link to commit 279b706 for more information
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
> ah, here it is, OK then
>
>>   arch/x86/mm/init.c |    5 +++++
>>   1 files changed, 5 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
>> index f5e0120..a7939ed 100644
>> --- a/arch/x86/mm/init.c
>> +++ b/arch/x86/mm/init.c
>> @@ -25,6 +25,11 @@ unsigned long __meminitdata pgt_buf_top;
>>
>>   static unsigned long min_pfn_mapped;
>>
>> +/*
>> + * Pages returned are already directly mapped.
>> + *
>> + * Changing that is likely to break Xen, see commit 279b706 for detail info.
>                                                                      ^detailed
>

When making references to git commits, please include the title of the 
commit:

  *
  * Changing that is likely to break Xen, see commit:
  *
  *    279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve
  *
  * for detailed information.

Otherwise it might be very confusing if we have an abbreviated hash 
collision or end up having to change git to use another hash system.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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