linux-kernel - [PATCH] x86/percpu: Use BIT_WORD() and BIT

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Message-ID: <20250616082119.157062-1-ubizjak@gmail.com>
Date: Mon, 16 Jun 2025 10:21:03 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: x86@...nel.org,
	linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] x86/percpu: Use BIT_WORD() and BIT_MASK() macros

Use BIT_WORD() and BIT_MASK() macros from <linux/bits.h>
instead of open-coding them.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/x86/include/asm/percpu.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index b0d03b6c279b..69243cb6dc9c 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -23,6 +23,7 @@
 #else /* !__ASSEMBLY__: */
 
 #include <linux/args.h>
+#include <linux/bits.h>
 #include <linux/build_bug.h>
 #include <linux/stringify.h>
 #include <asm/asm.h>
@@ -575,9 +576,9 @@ do {									\
 #define x86_this_cpu_constant_test_bit(_nr, _var)			\
 ({									\
 	unsigned long __percpu *addr__ =				\
-		(unsigned long __percpu *)&(_var) + ((_nr) / BITS_PER_LONG); \
+		(unsigned long __percpu *)&(_var) + BIT_WORD(_nr);	\
 									\
-	!!((1UL << ((_nr) % BITS_PER_LONG)) & raw_cpu_read(*addr__));	\
+	!!(BIT_MASK(_nr) & raw_cpu_read(*addr__));			\
 })
 
 #define x86_this_cpu_variable_test_bit(_nr, _var)			\
-- 
2.49.0