• Manfred Spraul's avatar
    kernel/cpu.c: create a CPU_STARTING cpu_chain notifier · e545a614
    Manfred Spraul authored
    
    
    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: default avatarManfred Spraul <manfred@colorfullife.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    e545a614
smp.c 29.1 KB