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x86: vdso: Remove bogus locking in update_vsyscall_tz() 

Changing the sequence count in update_vsyscall_tz() is completely
pointless.

The vdso code copies the data unprotected. There is no point to change
this as sys_tz is nowhere protected at all. See sys_gettimeofday().

Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner 2012-02-28 19:46:04 +00:00 committed by John Stultz
parent a4ca1298d8
commit 6c260d5863
1 changed files with 0 additions and 5 deletions
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5
arch/x86/kernel/vsyscall_64.c
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@ -80,12 +80,7 @@ early_param("vsyscall", vsyscall_setup);
void update_vsyscall_tz(void) void update_vsyscall_tz(void)
{ {
unsigned long flags;
write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
/* sys_tz has changed */
vsyscall_gtod_data.sys_tz = sys_tz; vsyscall_gtod_data.sys_tz = sys_tz;
write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
} }
void update_vsyscall(struct timespec *wall_time, struct timespec *wtm, void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,