clocksource/drivers/pistachio: Fix -Wunused-but-set-variable warning

pdp7 · dlezcano · commit 0642fb4ba68f · 2021-12-14T10:17:36.000+01:00
Variable 'overflow' set but not used, but this is the intended behavior. The hardware only updates the counter register after the overflow register read. However, the value of overflow is not actually needed. Link: https://lore.kernel.org/lkml/202111200402.afQsussU-lkp@intel.com/ Reported-by: kernel test robot <lkp@intel.com> Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Drew Fustini <dfustini@baylibre.com> Link: https://lore.kernel.org/r/20211123192524.1038304-1-dfustini@baylibre.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/drivers/clocksource/timer-pistachio.c b/drivers/clocksource/timer-pistachio.c
@@ -71,7 +71,8 @@ static u64 notrace
 pistachio_clocksource_read_cycles(struct clocksource *cs)
 {
 	struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
-	u32 counter, overflow;
+	__maybe_unused u32 overflow;
+	u32 counter;
 	unsigned long flags;
 
 	/*

Original file line number	Diff line number	Diff line change
`@@ -71,7 +71,8 @@ static u64 notrace`
`71`	`71`	`pistachio_clocksource_read_cycles(struct clocksource *cs)`
`72`	`72`	`{`
`73`	`73`	`struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);`
`74`		`- u32 counter, overflow;`
	`74`	`+ __maybe_unused u32 overflow;`
	`75`	`+ u32 counter;`
`75`	`76`	`unsigned long flags;`
`76`	`77`
`77`	`78`	`/*`