linux-kernel - Re: [PATCH 27/46] x86, mm: Add alloc_low

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Message-ID: <CAE9FiQUqOnOVtNUJdFfnh18EFjguxSiaRAhz0Eek5qbeLeUZWA@mail.gmail.com>
Date:	Tue, 13 Nov 2012 10:53:05 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, 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 27/46] x86, mm: Add alloc_low_pages(num)

On Tue, Nov 13, 2012 at 8:37 AM, Stefano Stabellini
<stefano.stabellini@...citrix.com> wrote:
> On Mon, 12 Nov 2012, Yinghai Lu wrote:
>> 32bit kmap mapping needs pages to be used for low to high.
>> At this point those pages are still from pgt_buf_* from BRK, so it is
>> ok now.
>> But we want to move early_ioremap_page_table_range_init() out of
>> init_memory_mapping() and only call it one time later, that will
>> make page_table_range_init/page_table_kmap_check/alloc_low_page to
>> use memblock to get page.
>>
>> memblock allocation for pages are from high to low.
>> So will get panic from page_table_kmap_check() that has BUG_ON to do
>> ordering checking.
>>
>> This patch add alloc_low_pages to make it possible to allocate serveral
>> pages at first, and hand out pages one by one from low to high.
>>
>> -v2: add one line comment about xen requirements.
>
> where is it?

removed.
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