clocksource: Add 'max_cycles' to 'struct clocksource'

[cascardo/linux.git] / include / linux / clocksource.h

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 9c78d15..16d048c 100644 (file)
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -56,6 +56,7 @@ struct module;
  * @shift:             cycle to nanosecond divisor (power of two)
  * @max_idle_ns:       max idle time permitted by the clocksource (nsecs)
  * @maxadj:            maximum adjustment value to mult (~11%)
+ * @max_cycles:                maximum safe cycle value which won't overflow on multiplication
  * @flags:             flags describing special properties
  * @archdata:          arch-specific data
  * @suspend:           suspend function for the clocksource, if necessary
@@ -76,7 +77,7 @@ struct clocksource {
 #ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
        struct arch_clocksource_data archdata;
 #endif
-
+       u64 max_cycles;
        const char *name;
        struct list_head list;
        int rating;
@@ -189,7 +190,7 @@ extern struct clocksource * __init clocksource_default_clock(void);
 extern void clocksource_mark_unstable(struct clocksource *cs);
 
 extern u64
-clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask);
+clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles);
 extern void
 clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);