linux-kernel - Re: [PATCH V5 0/6] RISC-V fixups to work with crash tool

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Message-ID: <b79ab47e-a1e2-eb21-0611-bcbc8b7802c5@linux.alibaba.com>
Date:   Tue, 9 Aug 2022 14:58:40 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, anup@...infault.org, heiko@...ech.de,
        guoren@...nel.org, mick@....forth.gr,
        alexandre.ghiti@...onical.com, bhe@...hat.com, vgoyal@...hat.com,
        dyoung@...hat.com, corbet@....net, Conor.Dooley@...rochip.com
Cc:     kexec@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        crash-utility@...hat.com, huanyi.xj@...baba-inc.com,
        heinrich.schuchardt@...onical.com, k-hagio-ab@....com,
        hschauhan@...ltrace.org, yixun.lan@...il.com
Subject: Re: [PATCH V5 0/6] RISC-V fixups to work with crash tool

Hi Palmer

Could you please help review this patch set?  thanks.

Crash-utility patch set is ready(acked by HAGIO KAZUHITO), now waiting 
the kernel patch set merged firstly.

在 2022/8/2 下午8:18, Xianting Tian 写道:
> I ever sent the patch 1 in the link:
> https://patchwork.kernel.org/project/linux-riscv/patch/20220708073150.352830-3-xianting.tian@linux.alibaba.com/
> And patch 2,3 in the link:
> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-2-xianting.tian@linux.alibaba.com/
> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-3-xianting.tian@linux.alibaba.com/
>
> This patch set just put these patches together, and with three new patch 4, 5, 6.
> these six patches are the fixups for machine_kexec, kernel mode PC for vmcore
> and improvements for vmcoreinfo, memory layout dump and fixup chedule out issue
> in machine_crash_shutdown().
>
> The main changes in the six patchs as below,
> Patch 1: use __smp_processor_id() instead of smp_processor_id() to cleanup
>           the console prints.
> Patch 2: Add VM layout, va bits, ram base to vmcoreinfo, which can simplify
>           the development of crash tool as ARM64 already did
>           (arch/arm64/kernel/crash_core.c).
> Patch 3: Add modules to virtual kernel memory layout dump.
> Patch 4: Fixup to get correct kernel mode PC for vmcore.
> Patch 5: Updates vmcoreinfo.rst.
> Patch 6: Fixup schedule out issue in machine_crash_shutdown()
>
> With these six patches(patch 2 is must), crash tool can work well to analyze
> a vmcore. The patches for crash tool for RISCV64 is in the link:
> https://lore.kernel.org/linux-riscv/20220801043040.2003264-1-xianting.tian@linux.alibaba.com/
>
> ------
> Changes v1 -> v2:
>   1, remove the patch "Add a fast call path of crash_kexec()" from this series
>   of patches, as it already applied to riscv git.
>   https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/?h=for-next&id=3f1901110a89b0e2e13adb2ac8d1a7102879ea98
>   2, add 'Reviewed-by' based on the comments of v1.
> Changes v2 -> v3:
>   use "riscv" instead of "riscv64" in patch 5 subject line.
> Changes v3 -> v4:
>   use "riscv" instead of "riscv64" in the summary of patch 5 subject line.
> Changes v4 -> v5:
>   add a new patch "RISC-V: Fixup schedule out issue in machine_crash_shutdown()"
>
> Xianting Tian (6):
>    RISC-V: use __smp_processor_id() instead of smp_processor_id()
>    RISC-V: Add arch_crash_save_vmcoreinfo support
>    riscv: Add modules to virtual kernel memory layout dump
>    RISC-V: Fixup getting correct current pc
>    riscv: crash_core: Export kernel vm layout, phys_ram_base
>    RISC-V: Fixup schedule out issue in machine_crash_shutdown()
>
>   .../admin-guide/kdump/vmcoreinfo.rst          | 31 +++++++++++++++++++
>   arch/riscv/kernel/Makefile                    |  1 +
>   arch/riscv/kernel/crash_core.c                | 29 +++++++++++++++++
>   arch/riscv/kernel/crash_save_regs.S           |  2 +-
>   arch/riscv/kernel/machine_kexec.c             | 28 ++++++++++++++---
>   arch/riscv/mm/init.c                          |  4 +++
>   6 files changed, 89 insertions(+), 6 deletions(-)
>   create mode 100644 arch/riscv/kernel/crash_core.c
>