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/powerpc/kernel/smp.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/kernel/smp.c') diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 5337ca7bb64..c27b10a1bd7 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -453,6 +453,7 @@ int __devinit start_secondary(void *unused) secondary_cpu_time_init(); ipi_call_lock(); + notify_cpu_starting(cpu); cpu_set(cpu, cpu_online_map); /* Update sibling maps */ base = cpu_first_thread_in_core(cpu); -- cgit v1.2.3