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authorIngo Molnar <mingo@elte.hu>2009-05-04 19:13:30 +0200
committerIngo Molnar <mingo@elte.hu>2009-05-04 19:30:32 +0200
commit0d905bca23aca5c86a10ee101bcd3b1abbd40b25 (patch)
tree5a4e6b956d1923ac1d28ae8b8f3034c1c90df5a5 /kernel/sched.c
parentba77813a2a22d631fe5bc0bf1ec0d11350544b70 (diff)
downloadop-kernel-dev-0d905bca23aca5c86a10ee101bcd3b1abbd40b25.zip
op-kernel-dev-0d905bca23aca5c86a10ee101bcd3b1abbd40b25.tar.gz
perf_counter: initialize the per-cpu context earlier
percpu scheduling for perfcounters wants to take the context lock, but that lock first needs to be initialized. Currently it is an early_initcall() - but that is too late, the task tick runs much sooner than that. Call it explicitly from the scheduler init sequence instead. [ Impact: fix access-before-init crash ] LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 2f600e3..a728976 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -39,6 +39,7 @@
#include <linux/completion.h>
#include <linux/kernel_stat.h>
#include <linux/debug_locks.h>
+#include <linux/perf_counter.h>
#include <linux/security.h>
#include <linux/notifier.h>
#include <linux/profile.h>
@@ -8996,7 +8997,7 @@ void __init sched_init(void)
* 1024) and two child groups A0 and A1 (of weight 1024 each),
* then A0's share of the cpu resource is:
*
- * A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
+ * A0's bandwidth = 1024 / (10*1024 + 1024 + 1024) = 8.33%
*
* We achieve this by letting init_task_group's tasks sit
* directly in rq->cfs (i.e init_task_group->se[] = NULL).
@@ -9097,6 +9098,8 @@ void __init sched_init(void)
alloc_bootmem_cpumask_var(&cpu_isolated_map);
#endif /* SMP */
+ perf_counter_init();
+
scheduler_running = 1;
}
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