linux-kernel - [PATCH v10 7/9] arm64: separate common LSUI definitions into lsui.h

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Message-Id: <20251103163224.818353-8-yeoreum.yun@arm.com>
Date: Mon,  3 Nov 2025 16:32:22 +0000
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
	will@...nel.org,
	maz@...nel.org,
	broonie@...nel.org,
	oliver.upton@...ux.dev,
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	scott@...amperecomputing.com,
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	mark.rutland@....com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
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	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v10 7/9] arm64: separate common LSUI definitions into lsui.h

This patch prepares for applying LSUI to the armv8_deprecated
SWP instruction.
Some LSUI-related definitions can be reused by armv8_deprecated.c,
so move the common definitions into a separate header file, lsui.h.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 arch/arm64/include/asm/futex.h | 15 +--------------
 arch/arm64/include/asm/lsui.h  | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 14 deletions(-)
 create mode 100644 arch/arm64/include/asm/lsui.h

diff --git a/arch/arm64/include/asm/futex.h b/arch/arm64/include/asm/futex.h
index ee79944df6fe..e75cfc5e3495 100644
--- a/arch/arm64/include/asm/futex.h
+++ b/arch/arm64/include/asm/futex.h
@@ -9,9 +9,8 @@
 #include <linux/uaccess.h>
 #include <linux/stringify.h>
 
-#include <asm/alternative.h>
-#include <asm/alternative-macros.h>
 #include <asm/errno.h>
+#include <asm/lsui.h>
 
 #define FUTEX_MAX_LOOPS	128 /* What's the largest number you can think of? */
 
@@ -97,8 +96,6 @@ __llsc_futex_cmpxchg(u32 __user *uaddr, u32 oldval, u32 newval, u32 *oval)
  * operation.
  */
 
-#define __LSUI_PREAMBLE	".arch_extension lsui\n"
-
 #define LSUI_FUTEX_ATOMIC_OP(op, asm_op, mb)				\
 static __always_inline int						\
 __lsui_futex_atomic_##op(int oparg, u32 __user *uaddr, int *oval)	\
@@ -249,16 +246,6 @@ __lsui_futex_cmpxchg(u32 __user *uaddr, u32 oldval, u32 newval, u32 *oval)
 	return __lsui_cmpxchg32(uaddr, oldval, newval, oval);
 }
 
-#define __lsui_llsc_body(op, ...)					\
-({									\
-	alternative_has_cap_likely(ARM64_HAS_LSUI) ?			\
-		__lsui_##op(__VA_ARGS__) : __llsc_##op(__VA_ARGS__);	\
-})
-
-#else	/* CONFIG_AS_HAS_LSUI */
-
-#define __lsui_llsc_body(op, ...)	__llsc_##op(__VA_ARGS__)
-
 #endif	/* CONFIG_AS_HAS_LSUI */
 
 
diff --git a/arch/arm64/include/asm/lsui.h b/arch/arm64/include/asm/lsui.h
new file mode 100644
index 000000000000..1a2ad408a47b
--- /dev/null
+++ b/arch/arm64/include/asm/lsui.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_LSUI_H
+#define __ASM_LSUI_H
+
+#ifdef CONFIG_AS_HAS_LSUI
+
+#define __LSUI_PREAMBLE	".arch_extension lsui\n"
+
+#include <linux/stringify.h>
+#include <asm/alternative.h>
+#include <asm/alternative-macros.h>
+#include <asm/cpucaps.h>
+
+#define __lsui_llsc_body(op, ...)					\
+({									\
+	alternative_has_cap_likely(ARM64_HAS_LSUI) ?			\
+		__lsui_##op(__VA_ARGS__) : __llsc_##op(__VA_ARGS__);	\
+})
+
+#else	/* CONFIG_AS_HAS_LSUI */
+
+#define __lsui_llsc_body(op, ...)	__llsc_##op(__VA_ARGS__)
+
+#endif	/* CONFIG_AS_HAS_LSUI */
+#endif	/* __ASM_LSUI_H */
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}