linux-kernel - Re: [PATCH] perf/x86/core: Remove repeating test expression

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Date:   Mon, 27 Feb 2023 17:57:30 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>
Subject: Re: [PATCH] perf/x86/core: Remove repeating test expression

On Mon, Feb 27, 2023 at 05:17:25PM +0530, Deepak R Varma wrote:
> Current implementation already checks validity of the cpu_type for the
> hybrid pmu two lines above. Hence there is no need to again include
> it in the immediate if test evaluation.
> 
> Signed-off-by: Deepak R Varma <drv@...lo.com>
> ---

Please disregard. I misread the bitwise operation as logical evaluation. Sorry
for any inconvenience.

Deepak.

>  arch/x86/events/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
> index 87a7f0cd77fd..89db2352deb9 100644
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -1893,7 +1893,7 @@ ssize_t events_hybrid_sysfs_show(struct device *dev,
>  	for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) {
>  		if (!(x86_pmu.hybrid_pmu[i].cpu_type & pmu_attr->pmu_type))
>  			continue;
> -		if (x86_pmu.hybrid_pmu[i].cpu_type & pmu->cpu_type) {
> +		if (pmu->cpu_type) {
>  			next_str = strchr(str, ';');
>  			if (next_str)
>  				return snprintf(page, next_str - str + 1, "%s", str);
> -- 
> 2.34.1
>