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SubjectRe: [PATCH 04 of 11] x86: fix early_ioremap pagetable ops

On Fri, 2008-01-25 at 13:23 -0800, Jeremy Fitzhardinge wrote:
> Put appropriate pagetable update hooks in so that paravirt knows
> what's going on in there.
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
> ---
> arch/x86/mm/ioremap.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -18,6 +18,7 @@
> #include <asm/fixmap.h>
> #include <asm/pgtable.h>
> #include <asm/tlbflush.h>
> +#include <asm/pgalloc.h>
>
> #ifdef CONFIG_X86_64
>
> @@ -265,7 +266,7 @@ void __init early_ioremap_init(void)
>
> pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
> memset(bm_pte, 0, sizeof(bm_pte));
> - set_pmd(pmd, __pmd(__pa(bm_pte) | _PAGE_TABLE));
> + pmd_populate_kernel(&init_mm, pmd, bm_pte);
>
> /*
> * The boot-ioremap range spans multiple pmds, for which
> @@ -295,6 +296,7 @@ void __init early_ioremap_clear(void)
>
> pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
> pmd_clear(pmd);
> + paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT);
> __flush_tlb_all();
> }

This seems to have ended up in f6df72e71eba621b2f5c49b3a763116fac748f6e
as:
+ paravirt_release_pt(__pa(pmd) >> PAGE_SHIFT);

and the pmd_populate_kernel hunk is missing altogether.

---
>From bfa2a08064a269dd7906ed5f60e436360e1360e7 Mon Sep 17 00:00:00 2001
From: Ian Campbell <ijc@hellion.org.uk>
Date: Thu, 31 Jan 2008 18:56:06 +0000
Subject: [PATCH] x86: fix early_ioremap pagetable ops for paravirt.
Some important parts of f6df72e71eba621b2f5c49b3a763116fac748f6e got dropped
along the way, reintroduce them.

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
---
arch/x86/mm/ioremap.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index ed4208e..93d931e 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -302,7 +302,7 @@ void __init early_ioremap_init(void)

pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
memset(bm_pte, 0, sizeof(bm_pte));
- set_pmd(pmd, __pmd(__pa(bm_pte) | _PAGE_TABLE));
+ pmd_populate_kernel(&init_mm, pmd, bm_pte);

/*
* The boot-ioremap range spans multiple pmds, for which
@@ -332,7 +332,7 @@ void __init early_ioremap_clear(void)

pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
pmd_clear(pmd);
- paravirt_release_pt(__pa(pmd) >> PAGE_SHIFT);
+ paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT);
__flush_tlb_all();
}

--
1.5.3.8


--
Ian Campbell

This fortune would be seven words long if it were six words shorter.



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