lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

kernel/cpu.c: create a CPU_STARTING cpu_chain notifier

Browse Source 
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>
This commit is contained in:
Manfred Spraul
2008-09-07 16:57:22 +02:00
committed by Ingo Molnar
parent 7686ad5606
commit e545a6140b
17 changed files with 51 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/kernel/smp.c
View File

@ -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);