From e545a6140b698b2494daf0b32107bdcc5e901390 Mon Sep 17 00:00:00 2001 From: Manfred Spraul Date: Sun, 7 Sep 2008 16:57:22 +0200 Subject: 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 Signed-off-by: Ingo Molnar --- arch/um/kernel/smp.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/um/kernel') 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; -- cgit v1.2.3