linux-kernel - Re: [PATCH resend] cpumask: don't perform while loop in cpumask_next

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Message-ID: <20150615144321.GI4255@pd.tnic>
Date:	Mon, 15 Jun 2015 16:43:21 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Amir Vadai <amirv@...lanox.com>, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH resend] cpumask: don't perform while loop in
 cpumask_next_and()

On Mon, Jun 15, 2015 at 11:33:52PM +0900, Sergey Senozhatsky wrote:
> Oh, wow, 8K cpus...

Standard CONFIG_MAXSMP setting. I believe distros set that. At least
SLES on x86_64 does and I'd bet RHEL does that too.

config NR_CPUS
        int "Maximum number of CPUs" if SMP && !MAXSMP
        range 2 8 if SMP && X86_32 && !X86_BIGSMP
        range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
        range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
        default "1" if !SMP
        default "8192" if MAXSMP
		^^^^^^

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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