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[PATCH] kill wall_jiffies

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With 2.6.18-rc4-mm2, now wall_jiffies will always be the same as jiffies.
So we can kill wall_jiffies completely.

This is just a cleanup and logically should not change any real behavior
except for one thing: RTC updating code in (old) ppc and xtensa use a
condition "jiffies - wall_jiffies == 1".  This condition is never met so I
suppose it is just a bug.  I just remove that condition only instead of
kill the whole "if" block.

[heiko.carstens@de.ibm.com: s390 build fix and cleanup]
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Atsushi Nemoto 2006-09-30 23:28:31 -07:00 • committed by Linus Torvalds
parent 70bc42f90a
commit 8ef386092d
26 changed files with 35 additions and 190 deletions
Download patch file Download diff file Expand all files Collapse all files

16
arch/sparc/kernel/pcic.c
View file

@ -765,8 +765,6 @@ static __inline__ unsigned long do_gettimeoffset(void)
return count;
}
extern unsigned long wall_jiffies;
static void pci_do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
@ -775,26 +773,17 @@ static void pci_do_gettimeofday(struct timeval *tv)
unsigned long max_ntp_tick = tick_usec - tickadj;
do {
unsigned long lost;
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = do_gettimeoffset();
lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
if (unlikely(time_adjust < 0)) {
if (unlikely(time_adjust < 0))
usec = min(usec, max_ntp_tick);
if (lost)
usec += lost * max_ntp_tick;
}
else if (unlikely(lost))
usec += lost * tick_usec;
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@ -819,8 +808,7 @@ static int pci_do_settimeofday(struct timespec *tv)
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
tv->tv_nsec -= 1000 * (do_gettimeoffset() +
(jiffies - wall_jiffies) * (USEC_PER_SEC / HZ));
tv->tv_nsec -= 1000 * do_gettimeoffset();
while (tv->tv_nsec < 0) {
tv->tv_nsec += NSEC_PER_SEC;
tv->tv_sec--;

18
arch/sparc/kernel/time.c
View file

@ -43,8 +43,6 @@
#include <asm/pcic.h>
#include <asm/of_device.h>
extern unsigned long wall_jiffies;
DEFINE_SPINLOCK(rtc_lock);
enum sparc_clock_type sp_clock_typ;
DEFINE_SPINLOCK(mostek_lock);
@ -449,7 +447,7 @@ unsigned long long sched_clock(void)
/* Ok, my cute asm atomicity trick doesn't work anymore.
* There are just too many variables that need to be protected
* now (both members of xtime, wall_jiffies, et al.)
* now (both members of xtime, et al.)
*/
void do_gettimeofday(struct timeval *tv)
{
@ -459,26 +457,17 @@ void do_gettimeofday(struct timeval *tv)
unsigned long max_ntp_tick = tick_usec - tickadj;
do {
unsigned long lost;
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = do_gettimeoffset();
lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
if (unlikely(time_adjust < 0)) {
if (unlikely(time_adjust < 0))
usec = min(usec, max_ntp_tick);
if (lost)
usec += lost * max_ntp_tick;
}
else if (unlikely(lost))
usec += lost * tick_usec;
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@ -521,8 +510,7 @@ static int sbus_do_settimeofday(struct timespec *tv)
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
nsec -= 1000 * (do_gettimeoffset() +
(jiffies - wall_jiffies) * (USEC_PER_SEC / HZ));
nsec -= 1000 * do_gettimeoffset();
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);