linux-kernel - Re: [PATCH] selftests/seccomp: Pin benchmark to single CPU

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Message-ID: <ZcIG8y0U1VyMsCAD@finisterre.sirena.org.uk>
Date: Tue, 6 Feb 2024 10:16:19 +0000
From: Mark Brown <broonie@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: kernel test robot <oliver.sang@...el.com>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>, Shuah Khan <shuah@...nel.org>,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] selftests/seccomp: Pin benchmark to single CPU

On Tue, Feb 06, 2024 at 01:56:47AM -0800, Kees Cook wrote:

> +	/* Set from highest CPU down. */
> +	for (cpu = ncores - 1; cpu >= 0; cpu--) {
> +		CPU_ZERO_S(setsz, setp);
> +		CPU_SET_S(cpu, setsz, setp);

Is there some particular reason to go from the highest CPU number down?
Not that it super matters but the default would be to iterate from 0 and
there's a comment but it just says the what not the why.

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