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Date: Mon, 10 Dec 2018 10:49:09 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Erick Cafferata <erick@cafferata.me>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>
Subject: Re: x86: e820 regression
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 <20181210085421.GA30792@hori1.linux.bs1.fc.nec.co.jp>
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On Mon, Dec 10, 2018 at 08:54:21AM +0000, Naoya Horiguchi wrote:
> Hi Erick,
> 
> On Mon, Dec 10, 2018 at 03:28:37AM -0500, Erick Cafferata wrote:
> > The following commit introduced a regression on my system.
> > 
> > 124049decbb121ec32742c94fb5d9d6bed8f24d8
> > x86/e820: put !E820_TYPE_RAM regions into memblock.reserved
> > 
> > and it was backported to stable, stopping the kernel to boot on my system since around 4.17.4.
> > It was reverted on upstream a couple months ago.
> > commit 2a5bda5a624d6471d25e953b9adba5182ab1b51f upstream
> 
> This commit seems not a correct pointer.
> In mainline, commit 124049decbb was reverted by
> 
>     commit 9fd61bc95130d4971568b89c9548b5e0a4e18e0e
>     Author: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
>     Date:   Fri Oct 26 15:10:24 2018 -0700
>     
>         Revert "x86/e820: put !E820_TYPE_RAM regions into memblock.reserved"
> 
> and, the original problem was finally fixed by
> 
>     commit 907ec5fca3dc38d37737de826f06f25b063aa08e
>     Author: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
>     Date:   Fri Oct 26 15:10:15 2018 -0700
>     
>         mm: zero remaining unavailable struct pages
>         
>         Patch series "mm: Fix for movable_node boot option", v3.
> 
> so I think both patches should be backported onto v4.17.z.

4.17.y and 4.18.y are long end-of-life, there's nothing I can do there.

I can apply the above patches to the 4.19.y tree, is that sufficient?

thanks,

greg k-h