From: Manfred Spraul <manfred@colorfullife.com>
Date: Sun, 7 Sep 2008 14:57:22 +0000 (+0200)
Subject: kernel/cpu.c: create a CPU_STARTING cpu_chain notifier
X-Git-Tag: v2.6.28-rc1~725^2~2^3
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e545a6140b698b2494daf0b32107bdcc5e901390;p=pandora-kernel.git

kernel/cpu.c: create a CPU_STARTING cpu_chain notifier

Right now, there is no notifier that is called on a new cpu, before the new
cpu begins processing interrupts/softirqs.
Various kernel function would need that notification, e.g. kvm works around
by calling smp_call_function_single(), rcu polls cpu_online_map.

The patch adds a CPU_STARTING notification. It also adds a helper function
that sends the message to all cpu_chain handlers.

Tested on x86-64.
All other archs are untested. Especially on sparc, I'm not sure if I got
it right.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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