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| author | Manfred Spraul <manfred@colorfullife.com> | 2008-09-07 16:57:22 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-08 19:25:24 +0200 |
| commit | e545a6140b698b2494daf0b32107bdcc5e901390 (patch) | |
| tree | 63f302e25ba7a0705bbf051f3817fac8f8b98aba /arch/alpha/kernel/smp.c | |
| parent | 7686ad5606f08d9dfb33a2087a36c8366366015b (diff) | |
| download | linux-e545a6140b698b2494daf0b32107bdcc5e901390.tar.gz linux-e545a6140b698b2494daf0b32107bdcc5e901390.tar.bz2 linux-e545a6140b698b2494daf0b32107bdcc5e901390.zip | |
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/alpha/kernel/smp.c')
| -rw-r--r-- | arch/alpha/kernel/smp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c index 83df541650fc..06b6fdab639f 100644 --- a/arch/alpha/kernel/smp.c +++ b/arch/alpha/kernel/smp.c @@ -149,6 +149,9 @@ smp_callin(void) atomic_inc(&init_mm.mm_count); current->active_mm = &init_mm; + /* inform the notifiers about the new cpu */ + notify_cpu_starting(cpuid); + /* Must have completely accurate bogos. */ local_irq_enable(); |