[PATCH v5 23/26] x86: vdso: Enable x86 to use common headers

[Vincenzo Frascino]

Enable x86 to use only the common headers in the implementation
of the vDSO library.

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
---
 arch/x86/include/asm/processor.h      | 12 +-----------
 arch/x86/include/asm/vdso/processor.h | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 11 deletions(-)
 create mode 100644 arch/x86/include/asm/vdso/processor.h

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 09705ccc393c..94789db550df 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/vdso/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:
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 */
-- 
2.25.1