linux-kernel - Re: [PATCH 04/42] arch/x86/events/core: Convert snprintf to sysfs

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Date: Tue, 16 Jan 2024 07:35:30 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: Adrian Hunter <adrian.hunter@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: 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>, Ian Rogers <irogers@...gle.com>, Thomas Gleixner
	<tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "H. Peter
 Anvin" <hpa@...or.com>, "linux-perf-users@...r.kernel.org"
	<linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH 04/42] arch/x86/events/core: Convert snprintf to
 sysfs_emit

Adrian,

On 16/01/2024 15:01, Adrian Hunter wrote:
>> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
>> index 40ad1425ffa2..52e5707be03b 100644
>> --- a/arch/x86/events/core.c
>> +++ b/arch/x86/events/core.c
>> @@ -1892,7 +1892,7 @@ ssize_t events_hybrid_sysfs_show(struct device *dev,
>>   		if (x86_pmu.hybrid_pmu[i].pmu_type & pmu->pmu_type) {
>>   			next_str = strchr(str, ';');
>>   			if (next_str)
>> -				return snprintf(page, next_str - str + 1, "%s", str);
>> +				return sysfs_emit(page, "%s", str);
> The intention seems to be to print only up to, and not including, the next ';',
> but sysfs_emit() is not going to do that.

Indeed, it intend to print a sub-string only, this conversion was wrong.
Let's leave it alone