Make in-kernel HZ be 1000 on x86, retaining user-level 100 HZ clock_t.

Stop using "struct tms" internally - always use timer ticks (or one of
the sane timeval/timespec types) instead.

Explicitly convert to clock_t when copying to user space for the old
broken interfaces that still use "clock_t".

Clean up and unify jiffies<->timeval conversion.

3 files changed, 36 insertions, 13 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 390627c2f1f6..6a83711022f8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -10,7 +10,6 @@ extern unsigned long event;
 #include <linux/threads.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
-#include <linux/times.h>
 #include <linux/timex.h>
 #include <linux/jiffies.h>
 #include <linux/rbtree.h>
@@ -310,7 +309,7 @@ struct task_struct {
 	unsigned long it_real_value, it_prof_value, it_virt_value;
 	unsigned long it_real_incr, it_prof_incr, it_virt_incr;
 	struct timer_list real_timer;
-	struct tms times;
+	unsigned long utime, stime, cutime, cstime;
 	unsigned long start_time;
 	long per_cpu_utime[NR_CPUS], per_cpu_stime[NR_CPUS];
 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
diff --git a/include/linux/time.h b/include/linux/time.h
index e7447958ece1..d9f9c6a340d8 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -12,6 +12,16 @@ struct timespec {
 };
 #endif /* _STRUCT_TIMESPEC */
 
+struct timeval {
+	time_t		tv_sec;		/* seconds */
+	suseconds_t	tv_usec;	/* microseconds */
+};
+
+struct timezone {
+	int	tz_minuteswest;	/* minutes west of Greenwich */
+	int	tz_dsttime;	/* type of dst correction */
+};
+
 #ifdef __KERNEL__
 
 /*
@@ -48,6 +58,27 @@ jiffies_to_timespec(unsigned long jiffies, struct timespec *value)
 	value->tv_sec = jiffies / HZ;
 }
 
+/* Same for "timeval" */
+static __inline__ unsigned long
+timeval_to_jiffies(struct timeval *value)
+{
+	unsigned long sec = value->tv_sec;
+	long usec = value->tv_usec;
+
+	if (sec >= (MAX_JIFFY_OFFSET / HZ))
+		return MAX_JIFFY_OFFSET;
+	usec += 1000000L / HZ - 1;
+	usec /= 1000000L / HZ;
+	return HZ * sec + usec;
+}
+
+static __inline__ void
+jiffies_to_timeval(unsigned long jiffies, struct timeval *value)
+{
+	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
+	value->tv_sec = jiffies / HZ;
+}
+
 
 /* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
  * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
@@ -88,17 +119,6 @@ extern struct timeval xtime;
 
 #endif /* __KERNEL__ */
 
-
-struct timeval {
-	time_t		tv_sec;		/* seconds */
-	suseconds_t	tv_usec;	/* microseconds */
-};
-
-struct timezone {
-	int	tz_minuteswest;	/* minutes west of Greenwich */
-	int	tz_dsttime;	/* type of dst correction */
-};
-
 #define NFDBITS			__NFDBITS
 
 #ifdef __KERNEL__
diff --git a/include/linux/times.h b/include/linux/times.h
index 569349ef461e..1174e9f88ea2 100644
--- a/include/linux/times.h
+++ b/include/linux/times.h
@@ -1,6 +1,10 @@
 #ifndef _LINUX_TIMES_H
 #define _LINUX_TIMES_H
 
+#ifdef __KERNEL__
+# define jiffies_to_clock_t(x) ((x) / (HZ / USER_HZ))
+#endif
+
 struct tms {
 	clock_t tms_utime;
 	clock_t tms_stime;