linux-kernel - Re: [PATCH v4 01/21] arm64: Fix labels in el2

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Message-ID: <20210118111341.porgvi56bzqlt36v@google.com>
Date:   Mon, 18 Jan 2021 11:13:41 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....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 v4 01/21] arm64: Fix labels in el2_setup macros

On Mon, Jan 18, 2021 at 09:45:13AM +0000, Marc Zyngier wrote:
> If someone happens to write the following code:
> 
> 	b	1f
> 	init_el2_state	vhe
> 1:
> 	[...]
> 
> they will be in for a long debugging session, as the label "1f"
> will be resolved *inside* the init_el2_state macro instead of
> after it. Not really what one expects.
> 
> Instead, rewite the EL2 setup macros to use unambiguous labels,
> thanks to the usual macro counter trick.
> 
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  arch/arm64/include/asm/el2_setup.h | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)

Acked-by: David Brazdil <dbrazdil@...gle.com>