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| author | Thomas Gleixner <tglx@linutronix.de> | 2010-05-23 08:14:45 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2010-05-24 11:50:38 +0200 |
| commit | bd45b7a385c5ffd82c11a1d51880be18559e5ad9 (patch) | |
| tree | d5fb7949b599a0a0aa86233d8c3118cc5b0bf9b9 /kernel/time.c | |
| parent | f4b87dee923342505e1ddba8d34ce9de33e75050 (diff) | |
| download | linux-bd45b7a385c5ffd82c11a1d51880be18559e5ad9.tar.gz linux-bd45b7a385c5ffd82c11a1d51880be18559e5ad9.tar.bz2 linux-bd45b7a385c5ffd82c11a1d51880be18559e5ad9.zip | |
timekeeping: Fix timezone update
commit 64ce4c2f (time: Clean up warp_clock()) breaks the timezone
update in a very subtle way. To avoid the direct access to timekeeping
internals it adds the timezone delta to the current time with
timespec_add_safe(). This works nicely when the timezone delta is > 0.
If timezone delta is < 0 then the wrap check in timespec_add_safe()
triggers and timespec_add_safe() returns TIME_MAX and screws up
timekeeping completely.
The comment above timespec_add_safe() says:
It's assumed that both values are valid (>= 0)
Add the timezone seconds adjustment directly.
Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time.c')
| -rw-r--r-- | kernel/time.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/time.c b/kernel/time.c index 50612faa9baf..848b1c2ab09a 100644 --- a/kernel/time.c +++ b/kernel/time.c @@ -132,10 +132,10 @@ SYSCALL_DEFINE2(gettimeofday, struct timeval __user *, tv, */ static inline void warp_clock(void) { - struct timespec delta, adjust; - delta.tv_sec = sys_tz.tz_minuteswest * 60; - delta.tv_nsec = 0; - adjust = timespec_add_safe(current_kernel_time(), delta); + struct timespec adjust; + + adjust = current_kernel_time(); + adjust.tv_sec += sys_tz.tz_minuteswest * 60; do_settimeofday(&adjust); } |