forked from rubenslte/android_kernel_samsung_msm8226
Greg Reid
5d9616e1f1
Introduce kernel user helper vsyscall to allow a higher performance gettimeofday implementation in user-space. Change-Id: I9b9971d217382129170ecd6a35461539dac9eebb Signed-off-by: Brent DeGraaf <bdegraaf@codeaurora.org>
24 lines
848 B
C
24 lines
848 B
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/export.h>
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#include <linux/clocksource.h>
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#include <linux/time.h>
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extern void *vectors_page;
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extern struct timezone sys_tz;
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/*
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* This read-write spinlock protects us from races in SMP while
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* updating the kernel user helper-embedded time.
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*/
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__cacheline_aligned_in_smp DEFINE_SEQLOCK(kuh_time_lock);
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