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-rw-r--r--include/linux/clocksource.h16
1 files changed, 11 insertions, 5 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 7784b597e..6013021a3 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -62,12 +62,18 @@ struct module;
* @suspend: suspend function for the clocksource, if necessary
* @resume: resume function for the clocksource, if necessary
* @owner: module reference, must be set by clocksource in modules
+ *
+ * Note: This struct is not used in hotpathes of the timekeeping code
+ * because the timekeeper caches the hot path fields in its own data
+ * structure, so no line cache alignment is required,
+ *
+ * The pointer to the clocksource itself is handed to the read
+ * callback. If you need extra information there you can wrap struct
+ * clocksource into your own struct. Depending on the amount of
+ * information you need you should consider to cache line align that
+ * structure.
*/
struct clocksource {
- /*
- * Hotpath data, fits in a single cache line when the
- * clocksource itself is cacheline aligned.
- */
cycle_t (*read)(struct clocksource *cs);
cycle_t mask;
u32 mult;
@@ -95,7 +101,7 @@ struct clocksource {
cycle_t wd_last;
#endif
struct module *owner;
-} ____cacheline_aligned;
+};
/*
* Clock source flags bits::