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[PATCH] ppc32: stop misusing NTP's time_offset value

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As part of my timeofday rework, I've been looking at the NTP code and I
noticed that the PPC architecture is apparently misusing the NTP's
time_offset (it is a terrible name!) value as some form of timezone offset.

This could cause problems when time_offset changed by the NTP code.  This
patch changes the PPC code so it uses a more clear local variable:
timezone_offset.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Acked-by: Tom Rini <trini@kernel.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
john stultz 2005-07-05 18:54:44 -07:00 committed by Linus Torvalds
parent e6b6239f8e
commit f326d22b8c
1 changed files with 8 additions and 5 deletions
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13
arch/ppc/kernel/time.c
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@ -89,6 +89,9 @@ unsigned long tb_to_ns_scale;
extern unsigned long wall_jiffies;
/* used for timezone offset */
static long timezone_offset;
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
@ -170,7 +173,7 @@ void timer_interrupt(struct pt_regs * regs)
xtime.tv_sec - last_rtc_update >= 659 &&
abs((xtime.tv_nsec / 1000) - (1000000-1000000/HZ)) < 500000/HZ &&
jiffies - wall_jiffies == 1) {
if (ppc_md.set_rtc_time(xtime.tv_sec+1 + time_offset) == 0)
if (ppc_md.set_rtc_time(xtime.tv_sec+1 + timezone_offset) == 0)
last_rtc_update = xtime.tv_sec+1;
else
/* Try again one minute later */
@ -286,7 +289,7 @@ void __init time_init(void)
unsigned old_stamp, stamp, elapsed;
if (ppc_md.time_init != NULL)
time_offset = ppc_md.time_init();
timezone_offset = ppc_md.time_init();
if (__USE_RTC()) {
/* 601 processor: dec counts down by 128 every 128ns */
@ -331,10 +334,10 @@ void __init time_init(void)
set_dec(tb_ticks_per_jiffy);
/* If platform provided a timezone (pmac), we correct the time */
if (time_offset) {
sys_tz.tz_minuteswest = -time_offset / 60;
if (timezone_offset) {
sys_tz.tz_minuteswest = -timezone_offset / 60;
sys_tz.tz_dsttime = 0;
xtime.tv_sec -= time_offset;
xtime.tv_sec -= timezone_offset;
}
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);