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linux/jiffies.h: Extract common header for vDSO 

The vDSO library should only include the necessary headers required for
a userspace library (UAPI and a minimal set of kernel headers). To make
this possible it is necessary to isolate from the kernel headers the
common parts that are strictly necessary to build the library.

Split jiffies.h into linux and common headers to make the latter suitable
for inclusion in the vDSO library.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200320145351.32292-14-vincenzo.frascino@arm.com
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:38 +00:00 committed by Thomas Gleixner
parent b72a9c5e02
commit 97b01d2eab
2 changed files with 12 additions and 3 deletions
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4
include/linux/jiffies.h
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@ -8,6 +8,7 @@
#include <linux/types.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <vdso/jiffies.h>
#include <asm/param.h> /* for HZ */
#include <generated/timeconst.h>
@ -59,9 +60,6 @@
extern int register_refined_jiffies(long clock_tick_rate);
/* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
/* TICK_USEC is the time between ticks in usec assuming SHIFTED_HZ */
#define TICK_USEC ((USEC_PER_SEC + HZ/2) / HZ)

11
include/vdso/jiffies.h Normal file
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@ -0,0 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VDSO_JIFFIES_H
#define __VDSO_JIFFIES_H
#include <asm/param.h> /* for HZ */
#include <vdso/time64.h>
/* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
#define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
#endif /* __VDSO_JIFFIES_H */