linux-kernel - Re: [PATCH v13 0/7] arm64: Add IPI for backtraces / kgdb; try to use NMI for some IPIs

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Date:   Mon, 25 Sep 2023 18:10:10 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Tomohiro Misono <misono.tomohiro@...itsu.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        Stephane Eranian <eranian@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        kgdb-bugreport@...ts.sourceforge.net,
        Stephen Boyd <swboyd@...omium.org>,
        linux-perf-users@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>, ito-yuichi@...itsu.com,
        gautham.shenoy@....com, jpoimboe@...nel.org, keescook@...omium.org,
        linux-kernel@...r.kernel.org, mingo@...nel.org, philmd@...aro.org,
        samitolvanen@...gle.com, scott@...amperecomputing.com,
        vschneid@...hat.com
Subject: Re: [PATCH v13 0/7] arm64: Add IPI for backtraces / kgdb; try to use NMI for some IPIs

On Wed, 06 Sep 2023 09:02:55 -0700, Douglas Anderson wrote:
> This is an attempt to resurrect Sumit's old patch series [1] that
> allowed us to use the arm64 pseudo-NMI to get backtraces of CPUs and
> also to round up CPUs in kdb/kgdb. The last post from Sumit that I
> could find was v7, so I started my series at v8. I haven't copied all
> of his old changelongs here, but you can find them from the link.
> 
> This patch series targets v6.6. Specifically it can't land in v6.5
> since it depends on commit 8d539b84f1e3 ("nmi_backtrace: allow
> excluding an arbitrary CPU").
> 
> [...]

Applied to arm64 (for-next/backtrace-ipi), thanks!

[1/7] irqchip/gic-v3: Enable support for SGIs to act as NMIs
      https://git.kernel.org/arm64/c/a02026bf9da1
[2/7] arm64: idle: Tag the arm64 idle functions as __cpuidle
      https://git.kernel.org/arm64/c/d0c14a7d36f0
[3/7] arm64: smp: Remove dedicated wakeup IPI
      https://git.kernel.org/arm64/c/2b2d0a7a96ab
[4/7] arm64: smp: Add arch support for backtrace using pseudo-NMI
      https://git.kernel.org/arm64/c/331a1b3a836c
[5/7] arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI
      https://git.kernel.org/arm64/c/d7402513c935
[6/7] arm64: kgdb: Implement kgdb_roundup_cpus() to enable pseudo-NMI roundup
      https://git.kernel.org/arm64/c/2f5cd0c7ffde
[7/7] arm64: smp: Mark IPI globals as __ro_after_init
      https://git.kernel.org/arm64/c/62817d5ba25d

-- 
Catalin