linux-kernel - Re: [PATCH v9 05/46] x86, mm: Revert back good

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Date:	Fri, 21 Dec 2012 16:22:59 +0800
From:	Dave Young <hidave.darkstar@...il.com>
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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 05/46] x86, mm: Revert back good_end setting for 64bit

On Thu, Nov 29, 2012 at 5:47 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> After
>
> | commit 8548c84da2f47e71bbbe300f55edb768492575f7
> | Author: Takashi Iwai <tiwai@...e.de>
> | Date:   Sun Oct 23 23:19:12 2011 +0200
> |
> |    x86: Fix S4 regression
> |
> |    Commit 4b239f458 ("x86-64, mm: Put early page table high") causes a S4
> |    regression since 2.6.39, namely the machine reboots occasionally at S4
> |    resume.  It doesn't happen always, overall rate is about 1/20.  But,
> |    like other bugs, once when this happens, it continues to happen.
> |
> |    This patch fixes the problem by essentially reverting the memory
> |    assignment in the older way.
>
> Have some page table around 512M again, that will prevent kdump to find 512M
> under 768M.
>
> We need revert that reverting, so we could put page table high again for 64bit.
>
> Takashi agreed that S4 regression could be something else.
>
>         https://lkml.org/lkml/2012/6/15/182
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Hi, Yinghai and HPA

What's the staus of this patch,  will it go for 3.8? Is there anything
blocking this patch?

> ---
>  arch/x86/mm/init.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index 9e17f9e..dbef4ff 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -234,8 +234,8 @@ static void __init find_early_table_space(struct map_range *mr, int nr_range)
>  #ifdef CONFIG_X86_32
>         /* for fixmap */
>         tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
> -#endif
>         good_end = max_pfn_mapped << PAGE_SHIFT;
> +#endif
>
>         base = memblock_find_in_range(start, good_end, tables, PAGE_SIZE);
>         if (!base)
> --
> 1.7.7
>
> --
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-- 
Regards
Dave
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