linux-kernel - [RFC PATCH 07/11] x86/softirq: Move softirq

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Message-ID: <20250222190623.262689-8-brgerst@gmail.com>
Date: Sat, 22 Feb 2025 14:06:19 -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 07/11] x86/softirq: Move softirq_pending to percpu hot section

No functional change.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/include/asm/current.h | 1 -
 arch/x86/include/asm/hardirq.h | 3 ++-
 arch/x86/kernel/irq.c          | 3 +++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index d51299af6145..6de46e2ae2b6 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -16,7 +16,6 @@ struct pcpu_hot {
 	union {
 		struct {
 			void			*hardirq_stack_ptr;
-			u16			softirq_pending;
 #ifdef CONFIG_X86_64
 			bool			hardirq_stack_inuse;
 #else
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 6ffa8b75f4cd..fa8ae99d62dd 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -66,7 +66,8 @@ extern u64 arch_irq_stat_cpu(unsigned int cpu);
 extern u64 arch_irq_stat(void);
 #define arch_irq_stat		arch_irq_stat
 
-#define local_softirq_pending_ref       pcpu_hot.softirq_pending
+DECLARE_PER_CPU_HOT(u16, softirq_pending);
+#define local_softirq_pending_ref       softirq_pending
 
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 /*
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 385e3a5fc304..1b51d5c05583 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -31,6 +31,9 @@
 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
 EXPORT_PER_CPU_SYMBOL(irq_stat);
 
+DEFINE_PER_CPU_HOT(u16, softirq_pending);
+EXPORT_PER_CPU_SYMBOL(softirq_pending);
+
 atomic_t irq_err_count;
 
 /*
-- 
2.48.1