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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-02-02 13:19:09 +0100
committerIngo Molnar <mingo@elte.hu>2011-02-03 12:14:43 +0100
commitfe4b04fa31a6dcf4358aa84cf81e5a7fd079469b (patch)
tree20a6db874d0db2a2f2e38e3ff77df4bdaa5f1cfe /include
parentb84defe6036e6dea782d41b80a4590e54f249671 (diff)
perf: Cure task_oncpu_function_call() races
Oleg reported that on architectures with __ARCH_WANT_INTERRUPTS_ON_CTXSW the IPI from task_oncpu_function_call() can land before perf_event_task_sched_in() and cause interesting situations for eg. perf_install_in_context(). This patch reworks the task_oncpu_function_call() interface to give a more usable primitive as well as rework all its users to hopefully be more obvious as well as remove the races. While looking at the code I also found a number of races against perf_event_task_sched_out() which can flip contexts between tasks so plug those too. Reported-and-reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h7
1 files changed, 0 insertions, 7 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index d747f948b34..0b40ee3f6d7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2578,13 +2578,6 @@ static inline void inc_syscw(struct task_struct *tsk)
#define TASK_SIZE_OF(tsk) TASK_SIZE
#endif
-/*
- * Call the function if the target task is executing on a CPU right now:
- */
-extern void task_oncpu_function_call(struct task_struct *p,
- void (*func) (void *info), void *info);
-
-
#ifdef CONFIG_MM_OWNER
extern void mm_update_next_owner(struct mm_struct *mm);
extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);