[PATCH v2 17/20] x86: vdso: Enable x86 to use common headers
From: Vincenzo Frascino <vincenzo.frascino@arm.com>
Date: 2020-03-06 13:33:48
Also in:
linux-arch, linux-mips, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Enable x86 to use only the common headers in the implementation of the vDSO library. Cc: Thomas Gleixner <redacted> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> --- arch/x86/include/asm/common/processor.h | 23 +++++++++++++++++++++++ arch/x86/include/asm/processor.h | 12 +----------- 2 files changed, 24 insertions(+), 11 deletions(-) create mode 100644 arch/x86/include/asm/common/processor.h
diff --git a/arch/x86/include/asm/common/processor.h b/arch/x86/include/asm/common/processor.h
new file mode 100644
index 000000000000..60ca2ee6e672
--- /dev/null
+++ b/arch/x86/include/asm/common/processor.h@@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2020 ARM Ltd. + */ +#ifndef __ASM_COMMON_PROCESSOR_H +#define __ASM_COMMON_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_COMMON_PROCESSOR_H */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 09705ccc393c..d66c5dd42cff 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h@@ -26,6 +26,7 @@ struct vm86; #include <asm/fpu/types.h> #include <asm/unwind_hints.h> #include <asm/vmxfeatures.h> +#include <asm/common/processor.h> #include <linux/personality.h> #include <linux/cache.h>
@@ -677,17 +678,6 @@ static inline unsigned int cpuid_edx(unsigned int op) return edx; } -/* 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(); -} - /* * This function forces the icache and prefetched instruction stream to * catch up with reality in two very specific cases:
--
2.25.1
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