linux-kernel - [PATCH RFC v2 03/28] ARM: entry: Skip ret_slow

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Message-Id: <20241029-arm-generic-entry-v2-3-573519abef38@linaro.org>
Date: Tue, 29 Oct 2024 11:52:43 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Oleg Nesterov <oleg@...hat.com>, Russell King <linux@...linux.org.uk>, 
 Kees Cook <kees@...nel.org>, Andy Lutomirski <luto@...capital.net>, 
 Will Drewry <wad@...omium.org>, Frederic Weisbecker <frederic@...nel.org>, 
 "Paul E. McKenney" <paulmck@...nel.org>, 
 Jinjie Ruan <ruanjinjie@...wei.com>, Arnd Bergmann <arnd@...db.de>, 
 Ard Biesheuvel <ardb@...nel.org>, Al Viro <viro@...iv.linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH RFC v2 03/28] ARM: entry: Skip ret_slow_syscall label

Don't introduce this extra label anymore now that we have
a clearly defined entry point for ret_to_user.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 arch/arm/kernel/entry-common.S | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index f379c852dcb7..2f93c2f6d5b8 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -102,7 +102,6 @@ ENDPROC(ret_fast_syscall)
  * do_work_pending() will update this state if necessary.
  */
 ENTRY(ret_to_user)
-ret_slow_syscall:
 #if IS_ENABLED(CONFIG_DEBUG_RSEQ)
 	/* do_rseq_syscall needs interrupts enabled. */
 	enable_irq_notrace			@ enable interrupts
@@ -136,7 +135,7 @@ ENTRY(ret_from_fork)
 	badrne	lr, 1f
 	retne	r5
 1:	get_thread_info tsk
-	b	ret_slow_syscall
+	b	ret_to_user
 ENDPROC(ret_from_fork)

 /*=============================================================================
@@ -310,13 +309,13 @@ __sys_trace_return_nosave:
 	enable_irq_notrace
 	mov	r0, sp
 	bl	syscall_trace_exit
-	b	ret_slow_syscall
+	b	ret_to_user

 __sys_trace_return:
 	str	r0, [sp, #S_R0 + S_OFF]!	@ save returned r0
 	mov	r0, sp
 	bl	syscall_trace_exit
-	b	ret_slow_syscall
+	b	ret_to_user

 	.macro	syscall_table_start, sym
 	.equ	__sys_nr, 0

-- 
2.46.2