linux-kernel - [PATCH 6/9] ARM: entry: add tick_nohz_user_enter_prepare() if CONFIG_GENERIC

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Message-ID: <20260125164016.331257-7-qq570070308@gmail.com>
Date: Mon, 26 Jan 2026 00:40:13 +0800
From: Xie Yuanbin <qq570070308@...il.com>
To: linux@...linux.org.uk,
	johannes@...solutions.net,
	masahiroy@...nel.org,
	jgross@...e.com,
	nsc@...nel.org,
	kees@...nel.org,
	tglx@...nel.org,
	mingo@...nel.org,
	frederic@...nel.org,
	paulmck@...nel.org,
	peterz@...radead.org,
	mathieu.desnoyers@...icios.com,
	luto@...nel.org,
	edumazet@...gle.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xie Yuanbin <qq570070308@...il.com>
Subject: [PATCH 6/9] ARM: entry: add tick_nohz_user_enter_prepare() if CONFIG_GENERIC_ENTRY

Starting from commit 47b8ff194c1fd73d58dc ("entry: Explicitly flush
pending rcuog wakeup before last rescheduling point"), if
CONFIG_GENERIC_ENTRY is enabled, tick_nohz_user_enter_prepare() should
be called before returning to user.

As for now, CONFIG_GENERIC_ENTRY is not available on ARM, so this commit
will not change the vmlinux.

Signed-off-by: Xie Yuanbin <qq570070308@...il.com>
---
 arch/arm/kernel/entry.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/kernel/entry.c b/arch/arm/kernel/entry.c
index 60e5c250da88..5de345e9146f 100644
--- a/arch/arm/kernel/entry.c
+++ b/arch/arm/kernel/entry.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <linux/linkage.h>
+#include <linux/tick.h>
 #include <linux/rseq_entry.h>
 #include <linux/irq-entry-common.h>
 #include <linux/kstack_erase.h>
@@ -14,6 +15,8 @@
 asmlinkage __section(".entry.text")
 void arm_exit_to_user_mode_no_work_pending(void)
 {
+	if (IS_ENABLED(CONFIG_GENERIC_ENTRY))
+		tick_nohz_user_enter_prepare();
 	rseq_irqentry_exit_to_user_mode();
 	exit_to_user_mode();
 #ifdef CONFIG_KSTACK_ERASE
-- 
2.51.0