perf: Default PMU ops

[firefly-linux-kernel-4.4.55.git] / include / linux / perf_event.h

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 6abf103fb7f891c028e7f6c9e48a0ade7ccd56b5..bf85733597ec7d6d6bf3f862093aba5ad7d5df6a 100644 (file)
--- 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 */
 };
 
 /**