linux-kernel - [tip: x86/core] x86/softirq: Move softirq pending next to current task

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Date:   Mon, 17 Oct 2022 14:54:04 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/softirq: Move softirq pending next to current task

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     7fcecafebed90d03f35bec6e147fc0b5f6e1bc71
Gitweb:        https://git.kernel.org/tip/7fcecafebed90d03f35bec6e147fc0b5f6e1bc71
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Thu, 15 Sep 2022 13:11:06 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 17 Oct 2022 16:41:05 +02:00

x86/softirq: Move softirq pending next to current task

Another hot variable which is strict per CPU and benefits from
being in the same cache line.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20220915111145.702133710@infradead.org
---
 arch/x86/include/asm/current.h | 1 +
 arch/x86/include/asm/hardirq.h | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index ac3090d..b89aba0 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -19,6 +19,7 @@ struct pcpu_hot {
 			int			cpu_number;
 			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 275e7fd..66837b8 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -3,9 +3,9 @@
 #define _ASM_X86_HARDIRQ_H
 
 #include <linux/threads.h>
+#include <asm/current.h>
 
 typedef struct {
-	u16	     __softirq_pending;
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 	u8	     kvm_cpu_l1tf_flush_l1d;
 #endif
@@ -60,6 +60,7 @@ 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
 
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 static inline void kvm_set_cpu_l1tf_flush_l1d(void)