linux-kernel - [RFC PATCH 4/6] x86/softirq: Support softirq disabled mask

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Date:   Tue,  1 Aug 2023 15:24:39 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [RFC PATCH 4/6] x86/softirq: Support softirq disabled mask

Support the new softirq disabled vectors mask and put in the per-cpu
hot structure along with the pending vectors mask as both are used
closely together.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 arch/x86/Kconfig               | 1 +
 arch/x86/include/asm/current.h | 1 +
 arch/x86/include/asm/hardirq.h | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a2a410d13e39..f1cd68b672dc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -93,6 +93,7 @@ config X86
 	select ARCH_HAS_COPY_MC			if X86_64
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SET_DIRECT_MAP
+	select ARCH_HAS_SOFTIRQ_DISABLED_MASK
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
 	select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index a1168e7b69e5..b86ca9c0ddc2 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -23,6 +23,7 @@ struct pcpu_hot {
 			unsigned long		top_of_stack;
 			void			*hardirq_stack_ptr;
 			u16			softirq_pending;
+			u16			softirq_disabled;
 #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 66837b8c67f1..933cf05e5738 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -61,6 +61,7 @@ extern u64 arch_irq_stat(void);
 #define arch_irq_stat		arch_irq_stat
 
 #define local_softirq_pending_ref       pcpu_hot.softirq_pending
+#define local_softirq_disabled_ref       pcpu_hot.softirq_disabled
 
 #if IS_ENABLED(CONFIG_KVM_INTEL)
 static inline void kvm_set_cpu_l1tf_flush_l1d(void)
-- 
2.34.1