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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
21 lines
480 B
C
21 lines
480 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* x86-specific clocksource additions */
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#ifndef _ASM_X86_CLOCKSOURCE_H
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#define _ASM_X86_CLOCKSOURCE_H
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#include <asm/vdso/clocksource.h>
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extern unsigned int vclocks_used;
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static inline bool vclock_was_used(int vclock)
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{
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return READ_ONCE(vclocks_used) & (1U << vclock);
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}
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static inline void vclocks_set_used(unsigned int which)
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{
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WRITE_ONCE(vclocks_used, READ_ONCE(vclocks_used) | (1 << which));
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}
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#endif /* _ASM_X86_CLOCKSOURCE_H */
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