linux-kernel - Re: [PATCH v4 1/7] asm-generic: ticket-lock: New generic ticket-based spinlock

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Date:   Wed, 04 May 2022 13:57:31 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Arnd Bergmann <arnd@...db.de>, linux-riscv@...ts.infradead.org
Cc:     guoren@...nel.org, 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, shorne@...il.com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu,
        Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        sudipm.mukherjee@...il.com, macro@...am.me.uk, 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, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: [PATCH v4 1/7] asm-generic: ticket-lock: New generic ticket-based spinlock

Am Samstag, 30. April 2022, 17:36:20 CEST schrieb Palmer Dabbelt:
> From: Peter Zijlstra <peterz@...radead.org>
> 
> This is a simple, fair spinlock.  Specifically it doesn't have all the
> subtle memory model dependencies that qspinlock has, which makes it more
> suitable for simple systems as it is more likely to be correct.  It is
> implemented entirely in terms of standard atomics and thus works fine
> without any arch-specific code.
> 
> This replaces the existing asm-generic/spinlock.h, which just errored
> out on SMP systems.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>

on riscv64+riscv32 qemu, beaglev and d1-nezha

Tested-by: Heiko Stuebner <heiko@...ech.de>