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>

1 files changed, 5 insertions, 5 deletions

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6abf103fb7f8..bf85733597ec 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -565,8 +565,8 @@ struct pmu {
 
         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 @@ struct pmu {
          * 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 */
 };
 
 /**