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

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Date:	Sat, 4 Apr 2015 11:40:54 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Toshi Kani <toshi.kani@...com>
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


* 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?

Thanks,

	Ingo
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