linux-kernel - Re: [Linux-nvdimm] [PATCH 1/2] x86: add support for the non-standard protected e820 type

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Date:	Mon, 06 Apr 2015 11:29:16 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Yinghai Lu <yinghai@...nel.org>, Christoph Hellwig <hch@....de>,
	linux-nvdimm@...1.01.org, linux-fsdevel@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [Linux-nvdimm] [PATCH 1/2] x86: add support for the
 non-standard protected e820 type

On Sat, 2015-04-04 at 11:40 +0200, Ingo Molnar wrote:
> * Toshi Kani <toshi.kani@...com> wrote:
> 
> > On Fri, 2015-04-03 at 10:12 -0700, Yinghai Lu wrote:
> > > On Fri, Apr 3, 2015 at 9:14 AM, Toshi Kani <toshi.kani@...com> wrote:
> > > > On Wed, 2015-04-01 at 09:12 +0200, Christoph Hellwig wrote:
> > > >   :
> > > >> @@ -748,7 +758,7 @@ u64 __init early_reserve_e820(u64 size, u64 align)
> > > >>  /*
> > > >>   * Find the highest page frame number we have available
> > > >>   */
> > > >> -static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
> > > >> +static unsigned long __init e820_end_pfn(unsigned long limit_pfn)
> > > >>  {
> > > >>       int i;
> > > >>       unsigned long last_pfn = 0;
> > > >> @@ -759,7 +769,11 @@ static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
> > > >>               unsigned long start_pfn;
> > > >>               unsigned long end_pfn;
> > > >>
> > > >> -             if (ei->type != type)
> > > >> +             /*
> > > >> +              * Persistent memory is accounted as ram for purposes of
> > > >> +              * establishing max_pfn and mem_map.
> > > >> +              */
> > > >> +             if (ei->type != E820_RAM && ei->type != E820_PRAM)
> > > >>                       continue;
> > > >
> > > > Should we also delete this code, accounting E820_PRAM as ram, along with
> > > > the deletion of reserve_pmem() in this version?
> > > 
> > > should revert those end_of_ram change as attached.
> > 
> > I confirmed that the pmem driver works with the change, and last_pfn is
> > updated as expected.
> 
> Could someone please send the fix with a changelog, etc?

OK, I will send a patch for the fix, with suggested update from
Christoph of not to re-add 'type' argument to e820_end_pfn().

Yinghai, I will add your sign-off to the patch.  Let me know if you have
any concern.

Thanks,
-Toshi

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