linux-kernel - [PATCH -next v4 10/19] arm64: entry: preempt_schedule

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Message-ID: <20241025100700.3714552-11-ruanjinjie@huawei.com>
Date: Fri, 25 Oct 2024 18:06:51 +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 10/19] arm64: entry: preempt_schedule_irq() only if PREEMPTION enabled

Whether PREEMPT_DYNAMIC enabled or not, PREEMPTION should
be enabled to allow reschedule after an interrupt.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 arch/arm64/kernel/entry-common.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index 3ea3ab32d232..58d660878c09 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -65,8 +65,6 @@ static noinstr irqentry_state_t enter_from_kernel_mode(struct pt_regs *regs)
 DEFINE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
 #define need_irq_preemption() \
 	(static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched))
-#else
-#define need_irq_preemption()	(IS_ENABLED(CONFIG_PREEMPTION))
 #endif
 
 static inline bool arm64_irqentry_exit_need_resched(void)
@@ -121,9 +119,12 @@ static void noinstr exit_to_kernel_mode(struct pt_regs *regs,
 			return;
 		}
 
-		if (!preempt_count()) {
-			if (need_resched() && arm64_irqentry_exit_need_resched())
-				preempt_schedule_irq();
+		if (IS_ENABLED(CONFIG_PREEMPTION)) {
+			if (!preempt_count()) {
+				if (need_resched() &&
+				    arm64_irqentry_exit_need_resched())
+					preempt_schedule_irq();
+			}
 		}
 
 		trace_hardirqs_on();
-- 
2.34.1