linux-kernel - [PATCH -next v4 12/19] arm64: entry: Check dynamic key ahead

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Message-ID: <20241025100700.3714552-13-ruanjinjie@huawei.com>
Date: Fri, 25 Oct 2024 18:06:53 +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 12/19] arm64: entry: Check dynamic key ahead

Check dynamic key ahead in raw_irqentry_exit_cond_resched(), which
will make arm64_irqentry_exit_need_resched() all about arch-specific.

No functional changes.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 arch/arm64/kernel/entry-common.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index 5b7df53cfcf6..3b110dcf4fa3 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -63,15 +63,10 @@ static noinstr irqentry_state_t enter_from_kernel_mode(struct pt_regs *regs)
 
 #ifdef CONFIG_PREEMPT_DYNAMIC
 DEFINE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
-#define need_irq_preemption() \
-	(static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched))
 #endif
 
 static inline bool arm64_irqentry_exit_need_resched(void)
 {
-	if (!need_irq_preemption())
-		return false;
-
 	/*
 	 * DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC
 	 * priority masking is used the GIC irqchip driver will clear DAIF.IF
@@ -97,6 +92,11 @@ static inline bool arm64_irqentry_exit_need_resched(void)
 
 void raw_irqentry_exit_cond_resched(void)
 {
+#ifdef CONFIG_PREEMPT_DYNAMIC
+	if (!static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched))
+		return;
+#endif
+
 	if (!preempt_count()) {
 		if (need_resched() && arm64_irqentry_exit_need_resched())
 			preempt_schedule_irq();
-- 
2.34.1