linux-kernel - [tip: core/rseq] entry: Inline irqentry_enter/exit_from/to_user

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Message-ID: <176173343009.2601451.13107534170776790002.tip-bot2@tip-bot2>
Date: Wed, 29 Oct 2025 10:23:50 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: core/rseq] entry: Inline irqentry_enter/exit_from/to_user_mode()

The following commit has been merged into the core/rseq branch of tip:

Commit-ID:     6a2d376e6e9bb4ac79ba1e72beaca5a74669aff6
Gitweb:        https://git.kernel.org/tip/6a2d376e6e9bb4ac79ba1e72beaca5a74669aff6
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 27 Oct 2025 09:44:40 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 29 Oct 2025 11:07:14 +01:00

entry: Inline irqentry_enter/exit_from/to_user_mode()

There is no point to have this as a function which just inlines
enter_from_user_mode(). The function call overhead is larger than the
function itself.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Link: https://patch.msgid.link/20251027084306.715309918@linutronix.de
---
 include/linux/irq-entry-common.h | 13 +++++++++++--
 kernel/entry/common.c            | 13 -------------
 2 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/include/linux/irq-entry-common.h b/include/linux/irq-entry-common.h
index 9b1f386..83c9d84 100644
--- a/include/linux/irq-entry-common.h
+++ b/include/linux/irq-entry-common.h
@@ -278,7 +278,10 @@ static __always_inline void exit_to_user_mode(void)
  *
  * The function establishes state (lockdep, RCU (context tracking), tracing)
  */
-void irqentry_enter_from_user_mode(struct pt_regs *regs);
+static __always_inline void irqentry_enter_from_user_mode(struct pt_regs *regs)
+{
+	enter_from_user_mode(regs);
+}
 
 /**
  * irqentry_exit_to_user_mode - Interrupt exit work
@@ -293,7 +296,13 @@ void irqentry_enter_from_user_mode(struct pt_regs *regs);
  * Interrupt exit is not invoking #1 which is the syscall specific one time
  * work.
  */
-void irqentry_exit_to_user_mode(struct pt_regs *regs);
+static __always_inline void irqentry_exit_to_user_mode(struct pt_regs *regs)
+{
+	instrumentation_begin();
+	exit_to_user_mode_prepare(regs);
+	instrumentation_end();
+	exit_to_user_mode();
+}
 
 #ifndef irqentry_state
 /**
diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index f62e1d1..70a16db 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -62,19 +62,6 @@ __always_inline unsigned long exit_to_user_mode_loop(struct pt_regs *regs,
 	return ti_work;
 }
 
-noinstr void irqentry_enter_from_user_mode(struct pt_regs *regs)
-{
-	enter_from_user_mode(regs);
-}
-
-noinstr void irqentry_exit_to_user_mode(struct pt_regs *regs)
-{
-	instrumentation_begin();
-	exit_to_user_mode_prepare(regs);
-	instrumentation_end();
-	exit_to_user_mode();
-}
-
 noinstr irqentry_state_t irqentry_enter(struct pt_regs *regs)
 {
 	irqentry_state_t ret = {