linux-kernel - Re: [RFC PATCH 1/5] use nr_cpus= to set nr_cpu

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Message-ID: <alpine.DEB.2.00.1001121436080.25925@router.home>
Date:	Tue, 12 Jan 2010 14:48:17 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/5] use nr_cpus= to set nr_cpu_ids early

Trouble is that NR_CPUS is used all over the place. If nr_cpu_ids <
NR_CPUS at boot then there is a danger of for loops to NR_CPUS going out
of
bounds.

CONFIG_NR_CPUS is used for various bitmaps so that seems to be
okay.

drivers/acpi/numa.c:acpi_numa_init probably should use nr_cpu_ids
instead now.

There is an octeon driver in staging that has some issues with NR_CPUS as
well.

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