linux-kernel - [PATCH -next v4 11/19] arm64: entry: Extract raw_irqentry_exit_cond

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Message-ID: <20241025100700.3714552-12-ruanjinjie@huawei.com>
Date: Fri, 25 Oct 2024 18:06:52 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <oleg@...hat.com>, <linux@...linux.org.uk>, <will@...nel.org>,
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Subject: [PATCH -next v4 11/19] arm64: entry: Extract raw_irqentry_exit_cond_resched() function

Extract the arm64 resched logic code to
raw_irqentry_exit_cond_resched() function, which makes the
code more clear when switch to generic entry.

No functional changes.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 arch/arm64/include/asm/preempt.h |  1 +
 arch/arm64/kernel/entry-common.c | 17 ++++++++++-------
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/preempt.h b/arch/arm64/include/asm/preempt.h
index 0159b625cc7f..d0f93385bd85 100644
--- a/arch/arm64/include/asm/preempt.h
+++ b/arch/arm64/include/asm/preempt.h
@@ -85,6 +85,7 @@ static inline bool should_resched(int preempt_offset)
 void preempt_schedule(void);
 void preempt_schedule_notrace(void);
 
+void raw_irqentry_exit_cond_resched(void);
 #ifdef CONFIG_PREEMPT_DYNAMIC
 
 DECLARE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index 58d660878c09..5b7df53cfcf6 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -95,6 +95,14 @@ static inline bool arm64_irqentry_exit_need_resched(void)
 	return true;
 }
 
+void raw_irqentry_exit_cond_resched(void)
+{
+	if (!preempt_count()) {
+		if (need_resched() && arm64_irqentry_exit_need_resched())
+			preempt_schedule_irq();
+	}
+}
+
 /*
  * Handle IRQ/context state management when exiting to kernel mode.
  * After this function returns it is not safe to call regular kernel code,
@@ -119,13 +127,8 @@ static void noinstr exit_to_kernel_mode(struct pt_regs *regs,
 			return;
 		}
 
-		if (IS_ENABLED(CONFIG_PREEMPTION)) {
-			if (!preempt_count()) {
-				if (need_resched() &&
-				    arm64_irqentry_exit_need_resched())
-					preempt_schedule_irq();
-			}
-		}
+		if (IS_ENABLED(CONFIG_PREEMPTION))
+			raw_irqentry_exit_cond_resched();
 
 		trace_hardirqs_on();
 	} else {
-- 
2.34.1