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Date:   Fri, 1 Oct 2021 13:04:28 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Huacai Chen <chenhuacai@loongson.cn>
Cc:     Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        David Airlie <airlied@linux.ie>,
        Jonathan Corbet <corbet@lwn.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-arch@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, Xuefeng Li <lixuefeng@loongson.cn>,
        Yanteng Si <siyanteng@loongson.cn>,
        Huacai Chen <chenhuacai@gmail.com>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH V4 07/22] LoongArch: Add atomic/locking headers
Message-ID: <YVbrPHsDkhTl4FTA@hirez.programming.kicks-ass.net>
References: <20210927064300.624279-1-chenhuacai@loongson.cn>
 <20210927064300.624279-8-chenhuacai@loongson.cn>
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On Mon, Sep 27, 2021 at 02:42:44PM +0800, Huacai Chen wrote:
> diff --git a/arch/loongarch/include/asm/spinlock.h b/arch/loongarch/include/asm/spinlock.h
> new file mode 100644
> index 000000000000..2544ee546596
> --- /dev/null
> +++ b/arch/loongarch/include/asm/spinlock.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_SPINLOCK_H
> +#define _ASM_SPINLOCK_H
> +
> +#include <asm/processor.h>
> +#include <asm/qspinlock.h>
> +#include <asm/qrwlock.h>
> +
> +#endif /* _ASM_SPINLOCK_H */
> diff --git a/arch/loongarch/include/asm/spinlock_types.h b/arch/loongarch/include/asm/spinlock_types.h
> new file mode 100644
> index 000000000000..91f258401ef9
> --- /dev/null
> +++ b/arch/loongarch/include/asm/spinlock_types.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_SPINLOCK_TYPES_H
> +#define _ASM_SPINLOCK_TYPES_H
> +
> +#include <asm-generic/qspinlock_types.h>
> +#include <asm-generic/qrwlock_types.h>
> +
> +#endif

Also see the many lkml threads on this, is there big enough loongson to
justify qspinlock? Have you tried a ticket lock?