linux-kernel - Re: [PATCH 04/19] x86, mm: only keep initial mapping for ram

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Date:	Mon, 22 Oct 2012 10:33:13 -0400
From:	Konrad Rzeszutek Wilk <konrad@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/19] x86, mm: only keep initial mapping for ram

On Thu, Oct 18, 2012 at 01:50:15PM -0700, Yinghai Lu wrote:
> 0 mean any e820 type, for any range is overlapped with any entry in e820,
> kernel will keep it's initial page table mapping.
> 
> What we want is only keeping initial page table for ram range.

Can you squash it in the previous patch then pls? It seems like
this is a bug-fix to a bug-fix. And since this patchset is still
out-side the Linus's tree you have the option of squashing/rebasing.

> 
> Change to E820_RAM and E820_RESERVED_KERN.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  arch/x86/mm/init_64.c |    9 ++++++---
>  1 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 61b3c44..4898e80 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -373,7 +373,8 @@ phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
>  		next = (addr & PAGE_MASK) + PAGE_SIZE;
>  		if (addr >= end) {
>  			if (!after_bootmem &&
> -			    !e820_any_mapped(addr & PAGE_MASK, next, 0))
> +			    !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) &&
> +			    !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN))
>  				set_pte(pte, __pte(0));
>  			continue;
>  		}
> @@ -420,7 +421,8 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
>  		next = (address & PMD_MASK) + PMD_SIZE;
>  		if (address >= end) {
>  			if (!after_bootmem &&
> -			    !e820_any_mapped(address & PMD_MASK, next, 0))
> +			    !e820_any_mapped(address & PMD_MASK, next, E820_RAM) &&
> +			    !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN))
>  				set_pmd(pmd, __pmd(0));
>  			continue;
>  		}
> @@ -494,7 +496,8 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
>  		next = (addr & PUD_MASK) + PUD_SIZE;
>  		if (addr >= end) {
>  			if (!after_bootmem &&
> -			    !e820_any_mapped(addr & PUD_MASK, next, 0))
> +			    !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) &&
> +			    !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN))
>  				set_pud(pud, __pud(0));
>  			continue;
>  		}
> -- 
> 1.7.7
> 
> --
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