linux-kernel - Re: 2.6.38.2 breaks suspend to disk

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Date:	Thu, 31 Mar 2011 09:05:24 +0200
From:	Michael Leun <lkml20101129@...ton.leun.net>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Mike Pagano <mpagano@...too.org>
Subject: Re: 2.6.38.2 breaks suspend to disk

On Wed, 30 Mar 2011 22:14:56 -0700
Yinghai Lu <yinghai@...nel.org> wrote:

> On 03/30/2011 11:32 AM, Michael Leun wrote:
> > Hi,
> >
> > suspend to disk works with 2.6.38.1 but does not with 2.6.38.2 on my
> > acer 1825ptz. Machine freezes after resume.
> >
> > git bisect yields:
> >
> > ml@...l:/usr/src/kernel/b/linux-2.6.38.y>  git bisect bad
> > ff518ea26654e05d325d996f6e3a7f5f569cc2d5 is the first bad commit
> > commit ff518ea26654e05d325d996f6e3a7f5f569cc2d5
> > Author: Yinghai Lu<yinghai@...nel.org>
> > Date:   Fri Feb 18 11:30:30 2011 +0000
> >
> >      x86: Cleanup highmap after brk is concluded
> >
> >      commit e5f15b45ddf3afa2bbbb10c7ea34fb32b6de0a0e upstream.
> >
> >      Now cleanup_highmap actually is in two steps: one is early in
> > head64.c and only clears above _end; a second one is in
> > init_memory_mapping() and tries to clean from _brk_end to _end.
> >      It should check if those boundaries are PMD_SIZE aligned but
> > currently does not.
> >      Also init_memory_mapping() is called several times for numa or
> > memory hotplug, so we really should not handle initial kernel
> > mappings there.
> >
> >      This patch moves cleanup_highmap() down after _brk_end is
> > settled so we can do everything in one step.
> >      Also we honor max_pfn_mapped in the implementation of
> > cleanup_highmap.
> >
> >      Signed-off-by: Yinghai Lu<yinghai@...nel.org>
> >      Signed-off-by: Stefano
> > Stabellini<stefano.stabellini@...citrix.com>
> > LKML-Reference:<alpine.DEB.2.00.1103171739050.3382@...all-desktop>
> > Signed-off-by: H. Peter Anvin<hpa@...or.com> Signed-off-by: Greg
> > Kroah-Hartman<gregkh@...e.de>
> >
> > :040000 040000 b5ed0c2971ba1162c7cd289dd351d1700eb52fbc
> > 8f830fdb43fa30ddebb485e6f6455d669300874b M      arch
> >
> 
> can you please try following partial reverting patch?
> 
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 7942335..07688d1 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -302,11 +302,11 @@ void __init init_extra_mapping_uc(unsigned long
> phys, unsigned long size) void __init cleanup_highmap(void)
>   {
>   	unsigned long vaddr = __START_KERNEL_map;
> -	unsigned long vaddr_end = __START_KERNEL_map +
> (max_pfn_mapped << PAGE_SHIFT); unsigned long end = roundup((unsigned
> long)_brk_end, PMD_SIZE) - 1; pmd_t *pmd = level2_kernel_pgt;
> +	pmd_t *last_pmd = pmd + PTRS_PER_PMD;
>   
> -	for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr +=
> PMD_SIZE) {
> +	for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
>   		if (pmd_none(*pmd))
>   			continue;
>   		if (vaddr < (unsigned long) _text || vaddr > end)
> 

Nope, unfortunately this does not change anything (neither when
applying ontop of the tree resulting from bisecting, nor ontop
2.6.38.2).

Just to make shure there was no mistake when bisecting I did

patch -R -p1 <~/linux-2.6.38.y.git-ff518ea26654e05d325d996f6e3a7f5f569cc2d5.txt

and then indeed it worked again.

-- 
MfG,

Michael Leun

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