linux-kernel - [PATCH v3 4/7] openrisc: Move to ticket-spinlock

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Date:   Thu, 14 Apr 2022 15:02:11 -0700
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     Arnd Bergmann <arnd@...db.de>, heiko@...ech.de, guoren@...nel.org,
        shorne@...il.com
Cc:     peterz@...radead.org, mingo@...hat.com,
        Will Deacon <will@...nel.org>, longman@...hat.com,
        boqun.feng@...il.com, jonas@...thpole.se,
        stefan.kristiansson@...nalahti.fi,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu,
        Arnd Bergmann <arnd@...db.de>, macro@...am.me.uk,
        Greg KH <gregkh@...uxfoundation.org>,
        sudipm.mukherjee@...il.com, wangkefeng.wang@...wei.com,
        jszhang@...nel.org, linux-csky@...r.kernel.org,
        linux-kernel@...r.kernel.org, openrisc@...ts.librecores.org,
        linux-riscv@...ts.infradead.org, linux-arch@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: [PATCH v3 4/7] openrisc: Move to ticket-spinlock

From: Peter Zijlstra <peterz@...radead.org>

We have no indications that openrisc meets the qspinlock requirements,
so move to ticket-spinlock as that is more likey to be correct.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
---
 arch/openrisc/Kconfig                      |  1 -
 arch/openrisc/include/asm/Kbuild           |  5 ++--
 arch/openrisc/include/asm/spinlock.h       | 27 ----------------------
 arch/openrisc/include/asm/spinlock_types.h |  7 ------
 4 files changed, 2 insertions(+), 38 deletions(-)
 delete mode 100644 arch/openrisc/include/asm/spinlock.h
 delete mode 100644 arch/openrisc/include/asm/spinlock_types.h

diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 0d68adf6e02b..99f0e4a4cbbd 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -30,7 +30,6 @@ config OPENRISC
 	select HAVE_DEBUG_STACKOVERFLOW
 	select OR1K_PIC
 	select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1
-	select ARCH_USE_QUEUED_SPINLOCKS
 	select ARCH_USE_QUEUED_RWLOCKS
 	select OMPIC if SMP
 	select ARCH_WANT_FRAME_POINTERS
diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
index ca5987e11053..3386b9c1c073 100644
--- a/arch/openrisc/include/asm/Kbuild
+++ b/arch/openrisc/include/asm/Kbuild
@@ -1,9 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 generic-y += extable.h
 generic-y += kvm_para.h
-generic-y += mcs_spinlock.h
-generic-y += qspinlock_types.h
-generic-y += qspinlock.h
+generic-y += spinlock_types.h
+generic-y += spinlock.h
 generic-y += qrwlock_types.h
 generic-y += qrwlock.h
 generic-y += user.h
diff --git a/arch/openrisc/include/asm/spinlock.h b/arch/openrisc/include/asm/spinlock.h
deleted file mode 100644
index 264944a71535..000000000000
--- a/arch/openrisc/include/asm/spinlock.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * OpenRISC Linux
- *
- * Linux architectural port borrowing liberally from similar works of
- * others.  All original copyrights apply as per the original source
- * declaration.
- *
- * OpenRISC implementation:
- * Copyright (C) 2003 Matjaz Breskvar <phoenix@...mi.com>
- * Copyright (C) 2010-2011 Jonas Bonn <jonas@...thpole.se>
- * et al.
- */
-
-#ifndef __ASM_OPENRISC_SPINLOCK_H
-#define __ASM_OPENRISC_SPINLOCK_H
-
-#include <asm/qspinlock.h>
-
-#include <asm/qrwlock.h>
-
-#define arch_spin_relax(lock)	cpu_relax()
-#define arch_read_relax(lock)	cpu_relax()
-#define arch_write_relax(lock)	cpu_relax()
-
-
-#endif
diff --git a/arch/openrisc/include/asm/spinlock_types.h b/arch/openrisc/include/asm/spinlock_types.h
deleted file mode 100644
index 7c6fb1208c88..000000000000
--- a/arch/openrisc/include/asm/spinlock_types.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef _ASM_OPENRISC_SPINLOCK_TYPES_H
-#define _ASM_OPENRISC_SPINLOCK_TYPES_H
-
-#include <asm/qspinlock_types.h>
-#include <asm/qrwlock_types.h>
-
-#endif /* _ASM_OPENRISC_SPINLOCK_TYPES_H */
-- 
2.34.1