linux-kernel - [PATCH v2 06/11] x86/softirq: Move softirq

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Message-ID: <20250226180531.1242429-7-brgerst@gmail.com>
Date: Wed, 26 Feb 2025 13:05:25 -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>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 06/11] 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 | 4 ++--
 arch/x86/kernel/irq.c          | 3 +++
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index 8ba2c0f8bcaf..f153c77853de 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -16,7 +16,6 @@ struct pcpu_hot {
 	struct task_struct	*current_task;
 	unsigned long		top_of_stack;
 	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..f00c09ffe6a9 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -3,7 +3,6 @@
 #define _ASM_X86_HARDIRQ_H
 
 #include <linux/threads.h>
-#include <asm/current.h>
 
 typedef struct {
 #if IS_ENABLED(CONFIG_KVM_INTEL)
@@ -66,7 +65,8 @@ 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_CACHE_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..474af15ae017 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_CACHE_HOT(u16, __softirq_pending);
+EXPORT_PER_CPU_SYMBOL(__softirq_pending);
+
 atomic_t irq_err_count;
 
 /*
-- 
2.48.1