linux-kernel - [PATCH 04/20] x86/cpu: Use named asm operands in clflushopt()

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Message-ID: <c007f4ddbfdfe92777a7df35bc121cf9bf0d0682.1741988314.git.jpoimboe@kernel.org>
Date: Fri, 14 Mar 2025 14:41:17 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Uros Bizjak <ubizjak@...il.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 04/20] x86/cpu: Use named asm operands in clflushopt()

Use named operands in preparation for removing the operand numbering
restrictions in alternative_io().

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/include/asm/special_insns.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 21ce480658b1..b905076cf7f6 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -176,10 +176,9 @@ static __always_inline void clflush(volatile void *__p)
 
 static inline void clflushopt(volatile void *__p)
 {
-	alternative_io(".byte 0x3e; clflush %0",
-		       ".byte 0x66; clflush %0",
-		       X86_FEATURE_CLFLUSHOPT,
-		       "+m" (*(volatile char __force *)__p));
+	alternative_io(".byte 0x3e; clflush %[val]",
+		       ".byte 0x66; clflush %[val]", X86_FEATURE_CLFLUSHOPT,
+		       [val] "+m" (*(volatile char __force *)__p));
 }
 
 static inline void clwb(volatile void *__p)
-- 
2.48.1