linux-kernel - Re: [PATCH] coresight: etm4x: avoid build failure with unrolled loops

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Message-ID: <48162555-2a67-60bc-ea4b-8720e7b98a22@arm.com>
Date:   Wed, 29 Sep 2021 11:29:50 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Tao Zhang <quic_taozha@...cinc.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Mao Jinlong <quic_jinlmao@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Arnd Bergmann <arnd@...nel.org>
Subject: Re: [PATCH] coresight: etm4x: avoid build failure with unrolled loops

Hi Tao

On 26/09/2021 11:35, Tao Zhang wrote:
> clang-12 fails to build the etm4x driver with -fsanitize=array-bounds,
> where it decides to unroll certain loops in a way that result in a
> C variable getting put into an inline assembly.
> 
> Search this build failure and find this is a known issue and there
> has been a mail thread discussing it.
> https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210429145752.3218324-1-arnd@kernel.org/
> According to the modification suggestions of this mail thread,
> coresight infrastucture has already provided another API that
> can replace the function that caused the error.
> 
> Used here "csdev_access_read32" to replace the original API
> "etm4x_relaxed_read32".
> 
> This patch applies to coresight/next
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> 
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>


Thanks for picking up the patch. Please could you convert all the other
variable indexed register access too ? That would save us spinning up
patches for fixing those individual cases whenever the compiler decides
to change its behavior.

Suzuki