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| author |  Vincenzo Frascino <vincenzo.frascino@arm.com>
| 2020-03-20 14:53:44 +0000 |
|---|---|---|
| committer |  Thomas Gleixner <tglx@linutronix.de>
| 2020-03-21 15:24:01 +0100 |
| commit | f511e079177a9b97175a9a3b0ee2374d55682403 (patch) | |
| tree | 37036a0586949ed054d03cbd462177eb2928e248 /arch/arm64/include/asm/vdso | |
| parent | arm64: vdso32: Code clean up (diff) | |
| download | linux-f511e079177a9b97175a9a3b0ee2374d55682403.tar.gz linux-f511e079177a9b97175a9a3b0ee2374d55682403.tar.bz2 linux-f511e079177a9b97175a9a3b0ee2374d55682403.zip | |
arm64: Introduce asm/vdso/processor.h
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/processor.h to contain all the arm64 specific
functions that are suitable for vDSO inclusion.
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/20200320145351.32292-20-vincenzo.frascino@arm.com
Diffstat (limited to 'arch/arm64/include/asm/vdso')
| -rw-r--r-- | arch/arm64/include/asm/vdso/processor.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/vdso/processor.h b/arch/arm64/include/asm/vdso/processor.h new file mode 100644 index 000000000000..ff830b766ad2 --- /dev/null +++ b/arch/arm64/include/asm/vdso/processor.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2020 ARM Ltd. + */ +#ifndef __ASM_VDSO_PROCESSOR_H +#define __ASM_VDSO_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +static inline void cpu_relax(void) +{ + asm volatile("yield" ::: "memory"); +} + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_VDSO_PROCESSOR_H */ |