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authorManfred Spraul <manfred@colorfullife.com>2008-09-07 16:57:22 +0200
committerIngo Molnar <mingo@elte.hu>2008-09-08 19:25:24 +0200
commite545a6140b698b2494daf0b32107bdcc5e901390 (patch)
tree63f302e25ba7a0705bbf051f3817fac8f8b98aba /arch/um
parent7686ad5606f08d9dfb33a2087a36c8366366015b (diff)
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>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/kernel/smp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
index be2d50c3aa95..045772142844 100644
--- a/arch/um/kernel/smp.c
+++ b/arch/um/kernel/smp.c
@@ -85,6 +85,7 @@ static int idle_proc(void *cpup)
while (!cpu_isset(cpu, smp_commenced_mask))
cpu_relax();
+ notify_cpu_starting(cpu);
cpu_set(cpu, cpu_online_map);
default_idle();
return 0;