forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

perf_counter: initialize the per-cpu context earlier

Browse source 
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>
This commit is contained in:
Ingo Molnar 2009-05-04 19:13:30 +02:00
commit 0d905bca23
3 changed files with 9 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/linux/perf_counter.h
View file

@ -573,6 +573,8 @@ extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
extern int sysctl_perf_counter_priv;
extern void perf_counter_init(void);
#else
static inline void
perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
@ -600,9 +602,10 @@ perf_counter_mmap(unsigned long addr, unsigned long len,
static inline void
perf_counter_munmap(unsigned long addr, unsigned long len,
unsigned long pgoff, struct file *file) { }
unsigned long pgoff, struct file *file) { }
static inline void perf_counter_comm(struct task_struct *tsk) { }
static inline void perf_counter_init(void) { }
#endif
#endif /* __KERNEL__ */