From: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Date: Wed, 11 Jan 2006 21:43:09 +0000 (+0100)
Subject: [PATCH] x86_64/i386: Remove preempt disable calls in lowlevel IPI
X-Git-Tag: v2.6.16-rc1~365
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=329d400f47ddfe8ff599823d739c5c5565da3207;p=pandora-kernel.git

[PATCH] x86_64/i386: Remove preempt disable calls in lowlevel IPI

I noticed that some lowlevel send_IPI_mask helpers had a hotplug/preempt
race whereupon the cpu_online_map was read before disabling preemption;

...
cpumask_t mask = cpu_online_map;
int cpu = get_cpu();
cpu_clear(cpu, mask);
...

But then i realised that there is no need for these lowlevel functions to
be going through all this trouble when all the callers are already made
hotplug/preempt safe.

Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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