linux-kernel - [PATCH 16/20] x86/cpu: Use alternative_io() in amd_clear

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Message-ID: <5f79d7213503c426cf4abc8292ae6d240cacb712.1741988314.git.jpoimboe@kernel.org>
Date: Fri, 14 Mar 2025 14:41:29 -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 16/20] x86/cpu: Use alternative_io() in amd_clear_divider()

Use the standard alternative_io() interface.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/include/asm/processor.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index b458ff0e4c79..d7f3f03594a2 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -709,8 +709,10 @@ static inline u32 per_cpu_l2c_id(unsigned int cpu)
  */
 static __always_inline void amd_clear_divider(void)
 {
-	asm volatile(ALTERNATIVE("", "div %[one]\n\t", X86_BUG_DIV0)
-		     :: "a" (0), "d" (0), [one] "r" (1));
+	alternative_io("",
+		       "div %[one]\n\t", X86_BUG_DIV0,
+		       ARG(),
+		       ARG("a" (0), "d" (0), [one] "r" (1)));
 }
 
 extern void amd_check_microcode(void);
-- 
2.48.1