diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2020-03-20 15:53:48 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-03-21 15:24:02 +0100 |
| commit | abc22418db02b986fc5623c035507b6357e191ed (patch) | |
| tree | fb42adafbef17a09024d7f7494e34930d0b3bb77 /arch/x86/include/asm/vdso | |
| parent | mips: vdso: Enable mips to use common headers (diff) | |
| download | linux-abc22418db02b986fc5623c035507b6357e191ed.tar.xz linux-abc22418db02b986fc5623c035507b6357e191ed.zip | |
x86/vdso: Enable x86 to use common headers
Enable x86 to use only the common headers in the implementation
of 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/20200320145351.32292-24-vincenzo.frascino@arm.com
Diffstat (limited to 'arch/x86/include/asm/vdso')
| -rw-r--r-- | arch/x86/include/asm/vdso/processor.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vdso/processor.h b/arch/x86/include/asm/vdso/processor.h new file mode 100644 index 000000000000..57b1a7034c64 --- /dev/null +++ b/arch/x86/include/asm/vdso/processor.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2020 ARM Ltd. + */ +#ifndef __ASM_VDSO_PROCESSOR_H +#define __ASM_VDSO_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ +static __always_inline void rep_nop(void) +{ + asm volatile("rep; nop" ::: "memory"); +} + +static __always_inline void cpu_relax(void) +{ + rep_nop(); +} + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_VDSO_PROCESSOR_H */ |