Received-SPF: pass (google.com: domain of linux-kernel+bounces-133673-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: LKML <linux-kernel@vger.kernel.org>,
	X86 Kernel <x86@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	iommu@lists.linux.dev,
	Thomas Gleixner <tglx@linutronix.de>,
	"Lu Baolu" <baolu.lu@linux.intel.com>,
	kvm@vger.kernel.org,
	Dave Hansen <dave.hansen@intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"Ingo Molnar" <mingo@redhat.com>
Cc: Paul Luse <paul.e.luse@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Jens Axboe <axboe@kernel.dk>,
	Raj Ashok <ashok.raj@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	maz@kernel.org,
	seanjc@google.com,
	"Robin Murphy" <robin.murphy@arm.com>,
	jim.harris@samsung.com,
	a.manzanares@samsung.com,
	"Bjorn Helgaas" <helgaas@kernel.org>,
	guang.zeng@intel.com,
	robert.hoo.linux@gmail.com,
	Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v2 07/13] x86/irq: Factor out calling ISR from common_interrupt
Date: Fri,  5 Apr 2024 15:31:04 -0700
Message-Id: <20240405223110.1609888-8-jacob.jun.pan@linux.intel.com>
In-Reply-To: <20240405223110.1609888-1-jacob.jun.pan@linux.intel.com>
References: <20240405223110.1609888-1-jacob.jun.pan@linux.intel.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Prepare for calling external IRQ handlers directly from the posted MSI
demultiplexing loop. Extract the common code with common interrupt to
avoid code duplication.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
 arch/x86/kernel/irq.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index f39f6147104c..c54de9378943 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -242,18 +242,10 @@ static __always_inline void handle_irq(struct irq_desc *desc,
 		__handle_irq(desc, regs);
 }
 
-/*
- * common_interrupt() handles all normal device IRQ's (the special SMP
- * cross-CPU interrupts have their own entry points).
- */
-DEFINE_IDTENTRY_IRQ(common_interrupt)
+static __always_inline void call_irq_handler(int vector, struct pt_regs *regs)
 {
-	struct pt_regs *old_regs = set_irq_regs(regs);
 	struct irq_desc *desc;
 
-	/* entry code tells RCU that we're not quiescent.  Check it. */
-	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
-
 	desc = __this_cpu_read(vector_irq[vector]);
 	if (likely(!IS_ERR_OR_NULL(desc))) {
 		handle_irq(desc, regs);
@@ -268,7 +260,20 @@ DEFINE_IDTENTRY_IRQ(common_interrupt)
 			__this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
 		}
 	}
+}
+
+/*
+ * common_interrupt() handles all normal device IRQ's (the special SMP
+ * cross-CPU interrupts have their own entry points).
+ */
+DEFINE_IDTENTRY_IRQ(common_interrupt)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
+	/* entry code tells RCU that we're not quiescent.  Check it. */
+	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
 
+	call_irq_handler(vector, regs);
 	set_irq_regs(old_regs);
 }
 
-- 
2.25.1