linux-kernel - Re: [PATCH v2 2/5] KVM: arm64: Compile stacktrace.nvhe.o

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Date:   Wed, 4 May 2022 09:02:27 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Quentin Perret <qperret@...gle.com>,
        Fuad Tabba <tabba@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>,
        Andrew Jones <drjones@...hat.com>,
        Marco Elver <elver@...gle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Keir Fraser <keirf@...gle.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] KVM: arm64: Compile stacktrace.nvhe.o

On Wed, May 4, 2022 at 7:17 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Mon, May 02, 2022 at 12:12:02PM -0700, Kalesh Singh wrote:
>
> > Recompile stack unwinding code for use with the nVHE hypervisor. This is
> > a preparatory patch that will allow reusing most of the kernel unwinding
> > logic in the nVHE hypervisor.
>
> >  enum stack_type {
> > -     STACK_TYPE_UNKNOWN,
> > +#ifndef __KVM_NVHE_HYPERVISOR__
> >       STACK_TYPE_TASK,
> >       STACK_TYPE_IRQ,
> >       STACK_TYPE_OVERFLOW,
> >       STACK_TYPE_SDEI_NORMAL,
> >       STACK_TYPE_SDEI_CRITICAL,
> > +#endif /* !__KVM_NVHE_HYPERVISOR__ */
> > +     STACK_TYPE_UNKNOWN,
> >       __NR_STACK_TYPES
> >  };
>
> I don't immediately see a problem with it but I'm curious as to why
> STACK_TYPE_UNKNOWN got moved to the end of the list here?  It does mean
> that zeroed memory will default to STACK_TYPE_TASK but we're not
> actually relying on that.  Otherwise

Hi Mark. Thanks for the reviews.

STACK_TYPE_UNKNOWN was moved to the end purely to group the common
enum values. Not a functionality change as we don't reply on an
uninitialized stack_type

Thanks,
Kalesh

>
> Reviwed-by: Mark Brown <broonie@...nel.org>
>
> --
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