From a25995e20a2ddcb4841ef25fccb16d3c37107fa9 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 28 Feb 2012 19:10:46 +0100 Subject: [PATCH 017/293] 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(). Signed-off-by: Thomas Gleixner --- arch/x86/kernel/vsyscall_64.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c index e4d4a22..f04adbd 100644 --- a/arch/x86/kernel/vsyscall_64.c +++ b/arch/x86/kernel/vsyscall_64.c @@ -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,