linux-kernel - Re: [PATCH 0/7] kexec_file: refactoring for other architecutres

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Message-ID: <20180306102818.GB25863@linaro.org>
Date:   Tue, 6 Mar 2018 19:28:19 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     Dave Young <dyoung@...hat.com>
Cc:     vgoyal@...hat.com, bhe@...hat.com, mpe@...erman.id.au,
        bauerman@...ux.vnet.ibm.com, prudo@...ux.vnet.ibm.com,
        kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH 0/7] kexec_file: refactoring for other architecutres

Dave,

On Mon, Mar 05, 2018 at 10:36:07AM +0800, Dave Young wrote:
> On 03/02/18 at 01:56pm, Dave Young wrote:
> > Hi AKASHI,
> > On 02/27/18 at 01:48pm, AKASHI Takahiro wrote:
> > > subject: 
> > > 
> > > This is a preparatory patch set for adding kexec_file support on arm64.
> > > 
> > > It was originally included in a arm64 patch set[1], but Philipp is also
> > > working on their kexec_file support on s390[2] and some changes are now
> > > conflicting.
> > > 
> > > So these common part was extracted and put into a separate patch set for
> > > better integration. What's more, my original patch#4 was split into a few
> > > small chunks for easier review after Dave's comment.
> > > 
> > > As such, the resulting code is basically identical with my original, and
> > > the only difference is that kexec_file_loaders[] is now declared in kexec.h
> > > after Phillipp's comment[3]. Other than that, this patch set doesn't
> > > require any changes on the rest of my original patch set(#1, #6 to #13).
> > > 
> > > Patch#1 allows making a use of purgatory optional, particularly useful
> > > for arm64.
> > > Patch#2 commonalizes arch_kexec_kernel_{image_probe, image_load,
> > > verify_sig}() and arch_kimage_file_post_load_cleanup() across architectures.
> > > Patch#3-#7 is also intended to generalize parse_elf64_headers(), along with
> > > exclude_mem_range(), to be made best re-use of.
> > > 
> > > [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-February/561182.html
> > > [2] http://lkml.iu.edu//hypermail/linux/kernel/1802.1/02596.html
> > > [3] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-February/562041.html
> > > 
> > > AKASHI Takahiro (7):
> > >   kexec_file: make an use of purgatory optional
> > >   kexec_file,x86,powerpc: factor out kexec_file_ops functions
> > >   x86: kexec_file: purge system-ram walking from prepare_elf64_headers()
> > >   x86: kexec_file: remove X86_64 dependency from prepare_elf64_headers()
> > >   x86: kexec_file: lift CRASH_MAX_RANGES limit on crash_mem buffer
> > >   x86: kexec_file: clean up prepare_elf64_headers()
> > >   kexec_file, x86: move re-factored code to generic side
> > > 
> > >  arch/powerpc/Kconfig                        |   3 +
> > >  arch/powerpc/include/asm/kexec.h            |   2 +-
> > >  arch/powerpc/kernel/kexec_elf_64.c          |   2 +-
> > >  arch/powerpc/kernel/machine_kexec_file_64.c |  39 +---
> > >  arch/x86/Kconfig                            |   3 +
> > >  arch/x86/include/asm/kexec-bzimage64.h      |   2 +-
> > >  arch/x86/kernel/crash.c                     | 332 +++++-----------------------
> > >  arch/x86/kernel/kexec-bzimage64.c           |   2 +-
> > >  arch/x86/kernel/machine_kexec_64.c          |  45 +---
> > >  include/linux/kexec.h                       |  36 ++-
> > >  kernel/kexec_file.c                         | 236 +++++++++++++++++++-
> > >  11 files changed, 336 insertions(+), 366 deletions(-)
> > > 
> > > -- 
> > > 2.16.2
> > > 
> > 
> > Reviewed them with eyes and provided some comments, but since it changed
> > the elf header code, I would like to do some basic vmcore related test
> > with crash tools.  Will response later.
> 
> Followup: I did some basic testing, did not find problems.

Thank you very much.
I have submitted a revised version now.
My apologies for your duplicating test efforts.

-Takahiro AKASHI


> > 
> > Overall the cleanups looks good, thank you a lot for the cleanups!
> > 
> > Thanks
> > Dave
> 
> Thanks
> Dave