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

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Date:   Sun, 26 Sep 2021 18:35:50 +0800
From:   Tao Zhang <quic_taozha@...cinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     Tao Zhang <quic_taozha@...cinc.com>,
        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>
Subject: [PATCH] coresight: etm4x: avoid build failure with unrolled loops

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>
---
 drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index f58afbab6e6d..0bca8e2be070 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -797,7 +797,7 @@ static void etm4_disable_hw(void *info)
 	/* read back the current counter values */
 	for (i = 0; i < drvdata->nr_cntr; i++) {
 		config->cntr_val[i] =
-			etm4x_relaxed_read32(csa, TRCCNTVRn(i));
+			csdev_access_read32(csa, TRCCNTVRn(i));
 	}
 
 	coresight_disclaim_device_unlocked(csdev);
-- 
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