* [PATCH] csky: Fixup csky_pmu.max_period assignment
@ 2019-09-27 3:02 guoren
0 siblings, 0 replies; only message in thread
From: guoren @ 2019-09-27 3:02 UTC (permalink / raw)
To: arnd; +Cc: linux-kernel, linux-arch, linux-csky, Mao Han, Guo Ren
From: Mao Han <han_mao@c-sky.com>
The csky_pmu.max_period has type u64, and BIT() can only return
32 bits unsigned long on C-SKY. The initialization for max_period
will be incorrect when count_width is bigger than 32.
Use BIG_ULL()
Signed-off-by: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
arch/csky/kernel/perf_event.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/csky/kernel/perf_event.c b/arch/csky/kernel/perf_event.c
index 4c1a193..7570109 100644
--- a/arch/csky/kernel/perf_event.c
+++ b/arch/csky/kernel/perf_event.c
@@ -1306,7 +1306,7 @@ int csky_pmu_device_probe(struct platform_device *pdev,
&csky_pmu.count_width)) {
csky_pmu.count_width = DEFAULT_COUNT_WIDTH;
}
- csky_pmu.max_period = BIT(csky_pmu.count_width) - 1;
+ csky_pmu.max_period = BIT_ULL(csky_pmu.count_width) - 1;
csky_pmu.plat_device = pdev;
--
2.7.4
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2019-09-27 3:03 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-09-27 3:02 [PATCH] csky: Fixup csky_pmu.max_period assignment guoren
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).