linux-kernel - Re: [PATCH v5 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by

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Date:   Mon, 25 Jan 2021 12:19:48 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v5 10/21] arm64: cpufeature: Use IDreg override in
 __read_sysreg_by_encoding()

On Mon, Jan 25, 2021 at 10:50:08AM +0000, Marc Zyngier wrote:
> __read_sysreg_by_encoding() is used by a bunch of cpufeature helpers,
> which should take the feature override into account. Let's do that.
> 
> For a good measure (and because we are likely to need to further
> down the line), make this helper available to the rest of the
> non-modular kernel.
> 
> Code that needs to know the *real* features of a CPU can still
> use read_sysreg_s(), and find the bare, ugly truth.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Acked-by: David Brazdil <dbrazdil@...gle.com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>