Commit 6c260d58 authored Feb 28, 2012 by Thomas Gleixner Committed by John Stultz Mar 15, 2012

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>

parent a4ca1298

arch/x86/kernel/vsyscall_64.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -80,12 +80,7 @@ early_param("vsyscall", vsyscall_setup);

		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;
		write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
		}

		void update_vsyscall(struct timespec wall_time, struct timespec wtm,