* [PATCH] arm64: perf: no need to initialise statics to 0
@ 2022-05-08 2:23 Jason Wang
2022-05-09 8:45 ` Mark Rutland
0 siblings, 1 reply; 2+ messages in thread
From: Jason Wang @ 2022-05-08 2:23 UTC (permalink / raw)
To: mark.rutland
Cc: will, catalin.marinas, peterz, mingo, acme, alexander.shishkin,
jolsa, namhyung, linux-arm-kernel, linux-perf-users, linux-kernel,
Jason Wang
Static variables do not need to be initialised to 0, because compiler
will initialise all uninitialised statics to 0. Thus, remove the
unneeded initializations.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
---
arch/arm64/kernel/perf_event.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index cb69ff1e6138..919fdcf8fce6 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1226,7 +1226,7 @@ static struct ctl_table armv8_pmu_sysctl_table[] = {
static void armv8_pmu_register_sysctl_table(void)
{
- static u32 tbl_registered = 0;
+ static u32 tbl_registered;
if (!cmpxchg_relaxed(&tbl_registered, 0, 1))
register_sysctl("kernel", armv8_pmu_sysctl_table);
--
2.35.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] arm64: perf: no need to initialise statics to 0
2022-05-08 2:23 [PATCH] arm64: perf: no need to initialise statics to 0 Jason Wang
@ 2022-05-09 8:45 ` Mark Rutland
0 siblings, 0 replies; 2+ messages in thread
From: Mark Rutland @ 2022-05-09 8:45 UTC (permalink / raw)
To: Jason Wang
Cc: will, catalin.marinas, peterz, mingo, acme, alexander.shishkin,
jolsa, namhyung, linux-arm-kernel, linux-perf-users, linux-kernel
On Sun, May 08, 2022 at 10:23:12AM +0800, Jason Wang wrote:
> Static variables do not need to be initialised to 0, because compiler
> will initialise all uninitialised statics to 0. Thus, remove the
> unneeded initializations.
>
> Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
I would strongly prefer that we leave this as-is.
There is no problem with explicitly initializing a static variable to 0, and it
clearly aligns with the cmpxchg arguments below. Removing the initialization
makes that *less* clear.
Thanks,
Mark.
> ---
> arch/arm64/kernel/perf_event.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
> index cb69ff1e6138..919fdcf8fce6 100644
> --- a/arch/arm64/kernel/perf_event.c
> +++ b/arch/arm64/kernel/perf_event.c
> @@ -1226,7 +1226,7 @@ static struct ctl_table armv8_pmu_sysctl_table[] = {
>
> static void armv8_pmu_register_sysctl_table(void)
> {
> - static u32 tbl_registered = 0;
> + static u32 tbl_registered;
>
> if (!cmpxchg_relaxed(&tbl_registered, 0, 1))
> register_sysctl("kernel", armv8_pmu_sysctl_table);
> --
> 2.35.1
>
>
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2022-05-08 2:23 [PATCH] arm64: perf: no need to initialise statics to 0 Jason Wang
2022-05-09 8:45 ` Mark Rutland
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