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

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Message-ID: <20180302055609.GA15422@dhcp-128-65.nay.redhat.com>
Date:   Fri, 2 Mar 2018 13:56:09 +0800
From:   Dave Young <dyoung@...hat.com>
To:     AKASHI Takahiro <takahiro.akashi@...aro.org>
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

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.

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

Thanks
Dave