linux-kernel - Re: [PATCH v2 1/3] perf/x86/core: Use sysfs

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Message-ID: <Y/Z8qUYDXPFlzdsY@hirez.programming.kicks-ass.net>
Date:   Wed, 22 Feb 2023 21:35:53 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Deepak R Varma <drv@...lo.com>
Cc:     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,
        Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>
Subject: Re: [PATCH v2 1/3] perf/x86/core: Use sysfs_emit() in show()
 callback function

On Tue, Feb 21, 2023 at 07:36:12PM +0530, Deepak R Varma wrote:
> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
> index 85a63a41c471..27c03e6dcb5d 100644
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -1896,9 +1896,7 @@ ssize_t events_hybrid_sysfs_show(struct device *dev,
>  		if (x86_pmu.hybrid_pmu[i].cpu_type & pmu->cpu_type) {
>  			next_str = strchr(str, ';');
>  			if (next_str)
> -				return snprintf(page, next_str - str + 1, "%s", str);
> -			else
> -				return sprintf(page, "%s", str);
> +				return sysfs_emit(page, "%s", str);
>  		}
>  		str = strchr(str, ';');
>  		str++;

How is this correct ?!?