| Message ID | 20200317122220.30393-20-vincenzo.frascino@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce common headers for vDSO | expand |
On Tue, Mar 17, 2020 at 12:22:13PM +0000, Vincenzo Frascino wrote: > 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. > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will@kernel.org> > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> This patch looks fine, though it depends on the previous discussion on compat ABI compatibility. Acked-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index 5ba63204d078..e51ef2dc5749 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -28,6 +28,8 @@ #include <linux/string.h> #include <linux/thread_info.h> +#include <vdso/processor.h> + #include <asm/alternative.h> #include <asm/cpufeature.h> #include <asm/hw_breakpoint.h> @@ -256,11 +258,6 @@ extern void release_thread(struct task_struct *); unsigned long get_wchan(struct task_struct *p); -static inline void cpu_relax(void) -{ - asm volatile("yield" ::: "memory"); -} - /* Thread switching */ extern struct task_struct *cpu_switch_to(struct task_struct *prev, struct task_struct *next); 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 */
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. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> --- arch/arm64/include/asm/processor.h | 7 ++----- arch/arm64/include/asm/vdso/processor.h | 17 +++++++++++++++++ 2 files changed, 19 insertions(+), 5 deletions(-) create mode 100644 arch/arm64/include/asm/vdso/processor.h