linux-kernel - Re: [PATCH -v2 00/10] x86: Use BRK to pre mapping page table to make xen happy

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Date:	Mon, 8 Oct 2012 23:45:18 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Jacob Shin <jacob.shin@....com>, Tejun Heo <tj@...nel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v2 00/10] x86: Use BRK to pre mapping page table to make
 xen happy

On Mon, Oct 8, 2012 at 11:25 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 10/09/2012 02:21 PM, Yinghai Lu wrote:
>>>
>>> Hi Yinghai,
>>>
>>> This patchset doesn't apply on top of tip:x86/mm2, starting at patch 08/10.
>>
>> sorry for that. I refresh my base to current linus/master and tip/master.
>>
>> could be some change there.
>>
>> could solve it:
>> 1. update x86/mm2 to linus/master
>> 2. or i resend the patch again with x86/mm2 as base.
>>
>> please let me know which one you like.
>>
>
> If it doesn't have cross-dependencies on other code, x86/mm2 is probably
> the best base; if there are other dependencies then that's fine, but we
> need to know what they are.  We don't want to create unnecessary tangles
> among topic branches, it makes Linus very unhappy.

old one in tip/x86/mm2:

void __init xen_init_mmu_ops(void)
{
        x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
        x86_init.paging.pagetable_setup_start = xen_pagetable_setup_start;
        x86_init.paging.pagetable_setup_done = xen_pagetable_setup_done;
        pv_mmu_ops = xen_mmu_ops;

in linus/master
2178 void __init xen_init_mmu_ops(void)
2179 {
2180         x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
2181         x86_init.paging.pagetable_init = xen_pagetable_init;
2182         pv_mmu_ops = xen_mmu_ops;
2183
2184         memset(dummy_mapping, 0xff, PAGE_SIZE);
2185 }

cause by commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=c711288727a62f74d48032e56e51333dd104bf58

rej:
--- arch/x86/xen/mmu.c
+++ arch/x86/xen/mmu.c
@@ -2169,7 +2165,7 @@

 void __init xen_init_mmu_ops(void)
 {
-       x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
+       x86_init.mapping.make_range_readwrite = xen_make_range_readwrite;
        x86_init.paging.pagetable_init = xen_pagetable_init;
        pv_mmu_ops = xen_mmu_ops;
--
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