linux-kernel - [RFC PATCH 11/11] x86/smp: Move this_cpu

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Message-ID: <20250222190623.262689-12-brgerst@gmail.com>
Date: Sat, 22 Feb 2025 14:06:23 -0500
From: Brian Gerst <brgerst@...il.com>
To: linux-kernel@...r.kernel.org,
	x86@...nel.org
Cc: Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Ard Biesheuvel <ardb@...nel.org>,
	Uros Bizjak <ubizjak@...il.com>,
	Brian Gerst <brgerst@...il.com>
Subject: [RFC PATCH 11/11] x86/smp: Move this_cpu_off to percpu hot section

No functional change.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/include/asm/percpu.h  | 2 +-
 arch/x86/kernel/setup_percpu.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 370778c55091..e8034fe81ec1 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -595,7 +595,7 @@ do {									\
 #include <asm-generic/percpu.h>
 
 /* We can use this directly for local CPU (faster). */
-DECLARE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off);
+DECLARE_PER_CPU_HOT(unsigned long, this_cpu_off);
 
 #endif /* !__ASSEMBLY__ */
 
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 0ea3443433c5..11a81e2a9675 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -26,7 +26,7 @@
 DEFINE_PER_CPU_HOT(int, cpu_number);
 EXPORT_PER_CPU_SYMBOL(cpu_number);
 
-DEFINE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off);
+DEFINE_PER_CPU_HOT(unsigned long, this_cpu_off);
 EXPORT_PER_CPU_SYMBOL(this_cpu_off);
 
 unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init;
-- 
2.48.1