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| author | Thomas Gleixner <tglx@linutronix.de> | 2012-02-28 19:46:04 +0000 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2012-03-15 18:17:57 -0700 |
| commit | 6c260d586343f7f78239d90aa9e2cfed02f74ff3 (patch) | |
| tree | cd5fc9a28499a098185878bd186736091e965ab4 /arch | |
| parent | a4ca1298d8a0472a45624fa5fb99f90f0f367187 (diff) | |
| download | linux-6c260d586343f7f78239d90aa9e2cfed02f74ff3.tar.gz linux-6c260d586343f7f78239d90aa9e2cfed02f74ff3.tar.bz2 linux-6c260d586343f7f78239d90aa9e2cfed02f74ff3.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/vsyscall_64.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c index b07ba9393564..33385c18e5d3 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, |