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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/x86 | |
| 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/x86')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 1 | ||||
| -rw-r--r-- | arch/x86/mach-voyager/voyager_smp.c | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 7985c5b3f916..0b8261c3cac2 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -257,6 +257,7 @@ static void __cpuinit smp_callin(void) end_local_APIC_setup(); map_cpu_to_logical_apicid(); + notify_cpu_starting(cpuid); /* * Get our bogomips. * diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c index ee0fba092157..199a5f4a873c 100644 --- a/arch/x86/mach-voyager/voyager_smp.c +++ b/arch/x86/mach-voyager/voyager_smp.c @@ -448,6 +448,8 @@ static void __init start_secondary(void *unused) VDEBUG(("VOYAGER SMP: CPU%d, stack at about %p\n", cpuid, &cpuid)); + notify_cpu_starting(cpuid); + /* enable interrupts */ local_irq_enable(); |