[MIPS] Use USECS_PER_SEC / HZ instead of tick_usec in do_gettimeofday.
authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Wed, 1 Mar 2006 06:16:26 +0000 (15:16 +0900)
committerRalf Baechle <ralf@linux-mips.org>
Wed, 1 Mar 2006 19:22:22 +0000 (19:22 +0000)
The 'tick_usec' is USER_HZ period in usec.  do_gettimeofday() should
use kernel HZ value.

Here is a patch for MIPS.  It seems m32r, m68k and sparc have same
problem though their HZ and USER_HZ are same for now.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/kernel/time.c

index 7050b4ffffcd34a992c6c99293cdb18d59fea15e..42c94c771afbe519ba538701be327a541463667b 100644 (file)
@@ -163,7 +163,7 @@ void do_gettimeofday(struct timeval *tv)
        unsigned long seq;
        unsigned long lost;
        unsigned long usec, sec;
        unsigned long seq;
        unsigned long lost;
        unsigned long usec, sec;
-       unsigned long max_ntp_tick = tick_usec - tickadj;
+       unsigned long max_ntp_tick;
 
        do {
                seq = read_seqbegin(&xtime_lock);
 
        do {
                seq = read_seqbegin(&xtime_lock);
@@ -178,12 +178,13 @@ void do_gettimeofday(struct timeval *tv)
                 * Better to lose some accuracy than have time go backwards..
                 */
                if (unlikely(time_adjust < 0)) {
                 * Better to lose some accuracy than have time go backwards..
                 */
                if (unlikely(time_adjust < 0)) {
+                       max_ntp_tick = (USEC_PER_SEC / HZ) - tickadj;
                        usec = min(usec, max_ntp_tick);
 
                        if (lost)
                                usec += lost * max_ntp_tick;
                } else if (unlikely(lost))
                        usec = min(usec, max_ntp_tick);
 
                        if (lost)
                                usec += lost * max_ntp_tick;
                } else if (unlikely(lost))
-                       usec += lost * tick_usec;
+                       usec += lost * (USEC_PER_SEC / HZ);
 
                sec = xtime.tv_sec;
                usec += (xtime.tv_nsec / 1000);
 
                sec = xtime.tv_sec;
                usec += (xtime.tv_nsec / 1000);