perf: Default PMU ops
Provide default implementations for the pmu txn methods, this
allows us to remove some conditional code.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
Cc: stephane eranian <eranian@googlemail.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Lin Ming <ming.m.lin@intel.com>
Cc: Yanmin <yanmin_zhang@linux.intel.com>
Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: Michael Cree <mcree@orcon.net.nz>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6abf103..bf85733 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -565,8 +565,8 @@
int *pmu_disable_count;
- void (*pmu_enable) (struct pmu *pmu);
- void (*pmu_disable) (struct pmu *pmu);
+ void (*pmu_enable) (struct pmu *pmu); /* optional */
+ void (*pmu_disable) (struct pmu *pmu); /* optional */
/*
* Should return -ENOENT when the @event doesn't match this PMU.
@@ -590,19 +590,19 @@
* Start the transaction, after this ->enable() doesn't need to
* do schedulability tests.
*/
- void (*start_txn) (struct pmu *pmu);
+ void (*start_txn) (struct pmu *pmu); /* optional */
/*
* If ->start_txn() disabled the ->enable() schedulability test
* then ->commit_txn() is required to perform one. On success
* the transaction is closed. On error the transaction is kept
* open until ->cancel_txn() is called.
*/
- int (*commit_txn) (struct pmu *pmu);
+ int (*commit_txn) (struct pmu *pmu); /* optional */
/*
* Will cancel the transaction, assumes ->disable() is called
* for each successfull ->enable() during the transaction.
*/
- void (*cancel_txn) (struct pmu *pmu);
+ void (*cancel_txn) (struct pmu *pmu); /* optional */
};
/**