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-rw-r--r--arch/x86/xen/time.c13
-rw-r--r--include/linux/math64.h2
-rw-r--r--include/linux/time.h11
-rw-r--r--lib/div64.c23
4 files changed, 30 insertions, 19 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index c39e1a5aa241..52b2e3856980 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -12,6 +12,7 @@
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/kernel_stat.h>
+#include <linux/math64.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
@@ -150,11 +151,7 @@ static void do_stolen_accounting(void)
if (stolen < 0)
stolen = 0;
- ticks = 0;
- while (stolen >= NS_PER_TICK) {
- ticks++;
- stolen -= NS_PER_TICK;
- }
+ ticks = iter_div_u64_rem(stolen, NS_PER_TICK, &stolen);
__get_cpu_var(residual_stolen) = stolen;
account_steal_time(NULL, ticks);
@@ -166,11 +163,7 @@ static void do_stolen_accounting(void)
if (blocked < 0)
blocked = 0;
- ticks = 0;
- while (blocked >= NS_PER_TICK) {
- ticks++;
- blocked -= NS_PER_TICK;
- }
+ ticks = iter_div_u64_rem(blocked, NS_PER_TICK, &blocked);
__get_cpu_var(residual_blocked) = blocked;
account_steal_time(idle_task(smp_processor_id()), ticks);
}
diff --git a/include/linux/math64.h b/include/linux/math64.h
index c1a5f81501ff..177785e1e4a3 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -81,4 +81,6 @@ static inline s64 div_s64(s64 dividend, s32 divisor)
}
#endif
+u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
+
#endif /* _LINUX_MATH64_H */
diff --git a/include/linux/time.h b/include/linux/time.h
index d32ef0ad4c0a..05f9517a8ed1 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -6,6 +6,7 @@
#ifdef __KERNEL__
# include <linux/cache.h>
# include <linux/seqlock.h>
+# include <linux/math64.h>
#endif
#ifndef _STRUCT_TIMESPEC
@@ -172,15 +173,7 @@ extern struct timeval ns_to_timeval(const s64 nsec);
*/
static inline void timespec_add_ns(struct timespec *a, u64 ns)
{
- ns += a->tv_nsec;
- while(unlikely(ns >= NSEC_PER_SEC)) {
- /* The following asm() prevents the compiler from
- * optimising this loop into a modulo operation. */
- asm("" : "+r"(ns));
-
- ns -= NSEC_PER_SEC;
- a->tv_sec++;
- }
+ a->tv_sec += iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
a->tv_nsec = ns;
}
#endif /* __KERNEL__ */
diff --git a/lib/div64.c b/lib/div64.c
index bb5bd0c0f030..76c01542d3e1 100644
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -98,3 +98,26 @@ EXPORT_SYMBOL(div64_u64);
#endif
#endif /* BITS_PER_LONG == 32 */
+
+/*
+ * Iterative div/mod for use when dividend is not expected to be much
+ * bigger than divisor.
+ */
+u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
+{
+ u32 ret = 0;
+
+ while (dividend >= divisor) {
+ /* The following asm() prevents the compiler from
+ optimising this loop into a modulo operation. */
+ asm("" : "+rm"(dividend));
+
+ dividend -= divisor;
+ ret++;
+ }
+
+ *remainder = dividend;
+
+ return ret;
+}
+EXPORT_SYMBOL(iter_div_u64_rem);