linux-kernel - [PATCH 2/3] openrisc: Use delay slot for clone and fork wrappers

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Message-Id: <20211204021842.1853549-3-shorne@gmail.com>
Date:   Sat,  4 Dec 2021 11:18:41 +0900
From:   Stafford Horne <shorne@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Openrisc <openrisc@...ts.librecores.org>,
        Stafford Horne <shorne@...il.com>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Randy Dunlap <rdunlap@...radead.org>,
        Petr Mladek <pmladek@...e.com>, Marc Zyngier <maz@...nel.org>,
        Chris Down <chris@...isdown.name>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 2/3] openrisc: Use delay slot for clone and fork wrappers

This saves one instruction.

Signed-off-by: Stafford Horne <shorne@...il.com>
---
 arch/openrisc/kernel/entry.S | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S
index c608f76e5753..8cd2113057c5 100644
--- a/arch/openrisc/kernel/entry.S
+++ b/arch/openrisc/kernel/entry.S
@@ -1162,15 +1162,13 @@ _fork_save_extra_regs_and_call:
 
 ENTRY(__sys_clone)
 	l.movhi	r29,hi(sys_clone)
-	l.ori	r29,r29,lo(sys_clone)
 	l.j	_fork_save_extra_regs_and_call
-	 l.nop
+	 l.ori	r29,r29,lo(sys_clone)
 
 ENTRY(__sys_fork)
 	l.movhi	r29,hi(sys_fork)
-	l.ori	r29,r29,lo(sys_fork)
 	l.j	_fork_save_extra_regs_and_call
-	 l.nop
+	 l.ori	r29,r29,lo(sys_fork)
 
 ENTRY(sys_rt_sigreturn)
 	l.jal	_sys_rt_sigreturn
-- 
2.31.1