linux-kernel - Re: [PATCH RESEND] cpufreq: p4-clockmod: Replace bool_int_array[NR

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Date:	Mon, 6 Jun 2016 10:27:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Bartosz Golaszewski <bgolaszewski@...libre.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Benoit Cousson <bcousson@...libre.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.de>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] cpufreq: p4-clockmod: Replace
 bool_int_array[NR_CPUS] with bitmap

On Sun, Jun 05, 2016 at 06:57:33PM +0200, Denys Vlasenko wrote:
> Straigntforward conversion from
>     int has_N44_O17_errata[NR_CPUS]
> to
>     DECLARE_BITMAP(has_N44_O17_errata, NR_CPUS)
> 
> Saves about 2 kbytes in bss for NR_CPUS=512.


Using cpumask_var_t would save even more bytes. Or making it a single
global variables even more.