linux-kernel - Re: [PATCH V6 0/6] RISC-V fixups to work with crash tool

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Date:   Wed, 12 Oct 2022 17:42:37 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.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, kexec@...ts.infradead.org,
        linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, crash-utility@...hat.com,
        heinrich.schuchardt@...onical.com, k-hagio-ab@....com,
        hschauhan@...ltrace.org, yixun.lan@...il.com
Subject: Re: [PATCH V6 0/6] RISC-V fixups to work with crash tool


在 2022/8/12 上午12:17, Palmer Dabbelt 写道:
> On Thu, 11 Aug 2022 00:41:44 PDT (-0700), 
> xianting.tian@...ux.alibaba.com wrote:
>> 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 
>> schedule out issue
>> in machine_crash_shutdown().
>>
>> The main changes in the six patchs as below,
>> Patch 1: Fixup use of smp_processor_id() in preemptible context, to 
>> cleanup
>>          the console prints.
>> Patch 2: Fixup to get correct kernel mode PC for kernel mode regs for 
>> vmcore.
>> Patch 3: Fixup schedule out issue in machine_crash_shutdown()
>> Patch 4: Add modules to virtual kernel memory layout dump.
>> Patch 5: 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 6: Updates vmcoreinfo.rst for vmcoreinfo export for RISCV64.
>>
>> 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()"
>> Changes v5 -> v6:
>>   1, move "fixup" patches to the start of the patch set.
>>   2, change patch 1, 2, 6's subject to make it tell more what it's 
>> about.
>>   3, add Fixes for patch 3.
>>   4, adjuest the changes format for patch 6.
>>
>>
>> Xianting Tian (6):
>>   RISC-V: kexec: Fixup use of smp_processor_id() in preemptible context
>>   RISC-V: Fixup get incorrect user mode PC for kernel mode regs
>>   RISC-V: Fixup schedule out issue in machine_crash_shutdown()
>>   RISC-V: Add modules to virtual kernel memory layout dump
>>   RISC-V: Add arch_crash_save_vmcoreinfo support
>>   Documentation: kdump: describe VMCOREINFO export for RISCV64
>>
>>  .../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
>
> Thank.  I've taken the first 4 onto for-next, which is still targeted 
> for 5.20, as they're fixes.  I'm not opposed to taking the 
> documentation patch for this cycle as well, it just needs some 
> going-over as the wording looks very odd (or at least it does to me 
> right now, maybe I'm just still half asleep).  Patch 5 is a new 
> feature, and given that it's being spun during the merge window it's 
> too late.

Hi Palmer

Do you plan to merge the two patch to Linux 6.1 to support crash tool 
work?  thanks

   RISC-V: kexec: Fixup use of smp_processor_id() in preemptible context
   RISC-V: Fixup get incorrect user mode PC for kernel mode regs