38 lines
1.1 KiB
Diff
38 lines
1.1 KiB
Diff
From 2cf94f15307db51a842030f33d189750a44a77f5 Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 28 Feb 2012 19:10:46 +0100
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Subject: [PATCH 017/282] x86: vdso: Remove bogus locking in
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update_vsyscall_tz()
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Changing the sequence count in update_vsyscall_tz() is completely
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pointless.
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The vdso code copies the data unprotected. There is no point to change
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this as sys_tz is nowhere protected at all. See sys_gettimeofday().
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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arch/x86/kernel/vsyscall_64.c | 5 -----
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1 file changed, 5 deletions(-)
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diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
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index e4d4a22..f04adbd 100644
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--- a/arch/x86/kernel/vsyscall_64.c
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+++ b/arch/x86/kernel/vsyscall_64.c
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@@ -80,12 +80,7 @@ early_param("vsyscall", vsyscall_setup);
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void update_vsyscall_tz(void)
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{
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- unsigned long flags;
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-
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- write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
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- /* sys_tz has changed */
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vsyscall_gtod_data.sys_tz = sys_tz;
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- write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
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}
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void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
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--
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1.7.10
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