linux-kernel - [PATCH] clocksource/drivers/imx: Fix -Wunused-but-set-variable warning

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Message-Id: <20231227143546.2823683-1-daniel.lezcano@linaro.org>
Date: Wed, 27 Dec 2023 15:35:46 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: tglx@...utronix.de
Cc: kernel test robot <lkp@...el.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	linux-kernel@...r.kernel.org (open list:CLOCKSOURCE, CLOCKEVENT DRIVERS),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE)
Subject: [PATCH] clocksource/drivers/imx: Fix -Wunused-but-set-variable warning

All warnings (new ones prefixed by >>):

   drivers/clocksource/timer-imx-gpt.c: In function 'mxc_timer_interrupt':
>> drivers/clocksource/timer-imx-gpt.c:279:18: warning: variable 'tstat' set but not used [-Wunused-but-set-variable]
     279 |         uint32_t tstat;
         |                  ^~~~~

vim +/tstat +279 drivers/clocksource/timer-imx-gpt.c

The change remove the tstats assignment but not the reading of the
register, assuming the register may be a ROR (Reset On Read) which
happens in the driver's interrupt registers.

Fixes: df181e382816 ("clocksource/drivers/imx-gpt: Add support for ARM64")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312231803.XzPddRa5-lkp@intel.com/
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-imx-gpt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-imx-gpt.c b/drivers/clocksource/timer-imx-gpt.c
index 6a878d227a13..489e69169ed4 100644
--- a/drivers/clocksource/timer-imx-gpt.c
+++ b/drivers/clocksource/timer-imx-gpt.c
@@ -258,9 +258,8 @@ static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
 {
 	struct clock_event_device *ced = dev_id;
 	struct imx_timer *imxtm = to_imx_timer(ced);
-	uint32_t tstat;
 
-	tstat = readl_relaxed(imxtm->base + imxtm->gpt->reg_tstat);
+	readl_relaxed(imxtm->base + imxtm->gpt->reg_tstat);
 
 	imxtm->gpt->gpt_irq_acknowledge(imxtm);
 
-- 
2.34.1