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BACKPORT: x86: Introduce asm/vdso/clocksource.h

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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.

Introduce asm/vdso/clocksource.h to contain all the arm64 specific
functions that are suitable for vDSO inclusion.

This header will be required by a future patch that will generalize
vdso/clocksource.h.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200320145351.32292-5-vincenzo.frascino@arm.com
(cherry picked from commit 659a9faa3f3c89de4c34c30c3da676059864e0fe)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 154668398
Change-Id: I43f978de32471f017fc1ed05f377ce52cdd7e7f4
This commit is contained in:
Vincenzo Frascino 2020-03-20 14:53:29 +00:00 • committed by Alistair Delva
commit 0fc2061eab
2 changed files with 12 additions and 5 deletions
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6
arch/x86/include/asm/clocksource.h
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@ -4,11 +4,7 @@
#ifndef _ASM_X86_CLOCKSOURCE_H
#define _ASM_X86_CLOCKSOURCE_H
#define VCLOCK_NONE 0 /* No vDSO clock available. */
#define VCLOCK_TSC 1 /* vDSO should use vread_tsc. */
#define VCLOCK_PVCLOCK 2 /* vDSO should use vread_pvclock. */
#define VCLOCK_HVCLOCK 3 /* vDSO should use vread_hvclock. */
#define VCLOCK_MAX 3
#include <asm/vdso/clocksource.h>
struct arch_clocksource_data {
int vclock_mode;

11
arch/x86/include/asm/vdso/clocksource.h Normal file
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@ -0,0 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSO_CLOCKSOURCE_H
#define __ASM_VDSO_CLOCKSOURCE_H
#define VCLOCK_NONE 0 /* No vDSO clock available. */
#define VCLOCK_TSC 1 /* vDSO should use vread_tsc. */
#define VCLOCK_PVCLOCK 2 /* vDSO should use vread_pvclock. */
#define VCLOCK_HVCLOCK 3 /* vDSO should use vread_hvclock. */
#define VCLOCK_MAX 3
#endif /* __ASM_VDSO_CLOCKSOURCE_H */