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linux/ktime.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 ktime.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/20200320145351.32292-15-vincenzo.frascino@arm.com
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:39 +00:00 committed by Thomas Gleixner
parent 97b01d2eab
commit cc56f32f00
2 changed files with 17 additions and 8 deletions
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9
include/linux/ktime.h
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@ -253,14 +253,7 @@ static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
}
}
/*
* The resolution of the clocks. The resolution value is returned in
* the clock_getres() system call to give application programmers an
* idea of the (in)accuracy of timers. Timer values are rounded up to
* this resolution values.
*/
#define LOW_RES_NSEC TICK_NSEC
#define KTIME_LOW_RES (LOW_RES_NSEC)
#include <vdso/ktime.h>
static inline ktime_t ns_to_ktime(u64 ns)
{

16
include/vdso/ktime.h Normal file
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@ -0,0 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VDSO_KTIME_H
#define __VDSO_KTIME_H
#include <vdso/jiffies.h>
/*
* The resolution of the clocks. The resolution value is returned in
* the clock_getres() system call to give application programmers an
* idea of the (in)accuracy of timers. Timer values are rounded up to
* this resolution values.
*/
#define LOW_RES_NSEC TICK_NSEC
#define KTIME_LOW_RES (LOW_RES_NSEC)
#endif /* __VDSO_KTIME_H */