linux-kernel - Re: [PATCH v2 1/3] Revert "x86/e820: put !E820_TYPE

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Date:   Tue, 2 Oct 2018 09:51:41 -0400
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Michal Hocko <mhocko@...nel.org>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 1/3] Revert "x86/e820: put !E820_TYPE_RAM regions into
 memblock.reserved"

On Tue, Oct 02, 2018 at 11:39:40AM +0200, Ingo Molnar wrote:
> 
> * Masayoshi Mizuma <msys.mizuma@...il.com> wrote:
> 
> > From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
> > 
> > commit 124049decbb1 ("x86/e820: put !E820_TYPE_RAM regions into
> > memblock.reserved") breaks movable_node kernel option because it
> > changed the memory gap range to reserved memblock. So, the node
> > is marked as Normal zone even if the SRAT has Hot plaggable affinity.
> > 
> >     =====================================================================
> >     kernel: BIOS-e820: [mem 0x0000180000000000-0x0000180fffffffff] usable
> >     kernel: BIOS-e820: [mem 0x00001c0000000000-0x00001c0fffffffff] usable
> >     ...
> >     kernel: reserved[0x12]#011[0x0000181000000000-0x00001bffffffffff], 0x000003f000000000 bytes flags: 0x0
> >     ...
> >     kernel: ACPI: SRAT: Node 2 PXM 6 [mem 0x180000000000-0x1bffffffffff] hotplug
> >     kernel: ACPI: SRAT: Node 3 PXM 7 [mem 0x1c0000000000-0x1fffffffffff] hotplug
> >     ...
> >     kernel: Movable zone start for each node
> >     kernel:  Node 3: 0x00001c0000000000
> >     kernel: Early memory node ranges
> >     ...
> >     =====================================================================
> > 
> > Naoya's v1 patch [*] fixes the original issue and this movable_node
> > issue doesn't occur.
> > Let's revert commit 124049decbb1 ("x86/e820: put !E820_TYPE_RAM
> > regions into memblock.reserved") and apply the v1 patch.
> > 
> > [*] https://lkml.org/lkml/2018/6/13/27
> > 
> > Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
> > Reviewed-by: Pavel Tatashin <pavel.tatashin@...rosoft.com>
> > ---
> >  arch/x86/kernel/e820.c | 15 +++------------
> >  1 file changed, 3 insertions(+), 12 deletions(-)
> 
> Bad ordering which introduces the bug and thus breaks bisection of related issues: the fixes 
> should come first, then the revert of the unnecessary or bad fix.

Thanks. I'll change the order, then resend them.

- Masa