linux-kernel - [RFC PATCH v2 33/34] x86/msr: Move the ARGS macros after the MSR read/write APIs

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Message-ID: <20250422082216.1954310-34-xin@zytor.com>
Date: Tue, 22 Apr 2025 01:22:14 -0700
From: "Xin Li (Intel)" <xin@...or.com>
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Subject: [RFC PATCH v2 33/34] x86/msr: Move the ARGS macros after the MSR read/write APIs

Since the ARGS macros are no longer used in the MSR read/write API
implementation, move them after their definitions.

Signed-off-by: Xin Li (Intel) <xin@...or.com>
---
 arch/x86/include/asm/msr.h | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index b4447ba4d6c2..be593a15a838 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -38,23 +38,6 @@ struct saved_msrs {
 	struct saved_msr *array;
 };
 
-/*
- * both i386 and x86_64 returns 64-bit value in edx:eax, but gcc's "A"
- * constraint has different meanings. For i386, "A" means exactly
- * edx:eax, while for x86_64 it doesn't mean rdx:rax or edx:eax. Instead,
- * it means rax *or* rdx.
- */
-#ifdef CONFIG_X86_64
-/* Using 64-bit values saves one instruction clearing the high half of low */
-#define DECLARE_ARGS(val, low, high)	unsigned long low, high
-#define EAX_EDX_VAL(val, low, high)	((low) | (high) << 32)
-#define EAX_EDX_RET(val, low, high)	"=a" (low), "=d" (high)
-#else
-#define DECLARE_ARGS(val, low, high)	u64 val
-#define EAX_EDX_VAL(val, low, high)	(val)
-#define EAX_EDX_RET(val, low, high)	"=A" (val)
-#endif
-
 /*
  * Be very careful with includes. This header is prone to include loops.
  */
@@ -559,6 +542,23 @@ static __always_inline int wrmsr_safe(u32 msr, u32 low, u32 high)
 extern int rdmsr_safe_regs(u32 regs[8]);
 extern int wrmsr_safe_regs(u32 regs[8]);
 
+/*
+ * both i386 and x86_64 returns 64-bit value in edx:eax, but gcc's "A"
+ * constraint has different meanings. For i386, "A" means exactly
+ * edx:eax, while for x86_64 it doesn't mean rdx:rax or edx:eax. Instead,
+ * it means rax *or* rdx.
+ */
+#ifdef CONFIG_X86_64
+/* Using 64-bit values saves one instruction clearing the high half of low */
+#define DECLARE_ARGS(val, low, high)	unsigned long low, high
+#define EAX_EDX_VAL(val, low, high)	((low) | (high) << 32)
+#define EAX_EDX_RET(val, low, high)	"=a" (low), "=d" (high)
+#else
+#define DECLARE_ARGS(val, low, high)	u64 val
+#define EAX_EDX_VAL(val, low, high)	(val)
+#define EAX_EDX_RET(val, low, high)	"=A" (val)
+#endif
+
 static __always_inline u64 native_rdpmcq(int counter)
 {
 	DECLARE_ARGS(val, low, high);
@@ -571,6 +571,10 @@ static __always_inline u64 native_rdpmcq(int counter)
 	return EAX_EDX_VAL(val, low, high);
 }
 
+#undef DECLARE_ARGS
+#undef EAX_EDX_VAL
+#undef EAX_EDX_RET
+
 static __always_inline u64 rdpmcq(int counter)
 {
 #ifdef CONFIG_XEN_PV
-- 
2.49.0