linux-kernel - Re: [PATCH v3 1/4] x86: kdump: move reserve_crashkernel_low() into kexec

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Date:   Fri, 12 Apr 2019 09:00:27 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Chen Zhou <chenzhou10@...wei.com>
Cc:     wangkefeng.wang@...wei.com, horms@...ge.net.au,
        ard.biesheuvel@...aro.org, catalin.marinas@....com,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        rppt@...ux.ibm.com, linux-mm@...ck.org, takahiro.akashi@...aro.org,
        mingo@...hat.com, bp@...en8.de, ebiederm@...ssion.com,
        kexec@...ts.infradead.org, tglx@...utronix.de,
        akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/4] x86: kdump: move reserve_crashkernel_low() into
 kexec_core.c


* Chen Zhou <chenzhou10@...wei.com> wrote:

> Hi Ingo,
> 
> On 2019/4/10 15:09, Ingo Molnar wrote:
> > 
> > * Chen Zhou <chenzhou10@...wei.com> wrote:
> > 
> >> In preparation for supporting more than one crash kernel regions
> >> in arm64 as x86_64 does, move reserve_crashkernel_low() into
> >> kexec/kexec_core.c.
> >>
> >> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> >> ---
> >>  arch/x86/include/asm/kexec.h |  3 ++
> >>  arch/x86/kernel/setup.c      | 66 +++++---------------------------------------
> >>  include/linux/kexec.h        |  1 +
> >>  kernel/kexec_core.c          | 53 +++++++++++++++++++++++++++++++++++
> >>  4 files changed, 64 insertions(+), 59 deletions(-)
> > 
> > No objections for this to be merged via the ARM tree, as long as x86 
> > functionality is kept intact.
> 
> This patch has no affect on x86.

In *principle*.

In practice the series does change x86 code:

> >>  arch/x86/kernel/setup.c      | 66 +++++---------------------------------------
> >>  include/linux/kexec.h        |  1 +
> >>  kernel/kexec_core.c          | 53 +++++++++++++++++++++++++++++++++++

which is, *hopefully*, an identity transformation. :-)

I.e. Ack, but only if it doesn't break anything. :-)

Thanks,

	Ingo