linux-kernel - Re: [PATCH v3 10/25] openrisc: add spinlock implementation

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Message-ID: <20170222114117.GR6515@twins.programming.kicks-ass.net>
Date:   Wed, 22 Feb 2017 12:41:17 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Stafford Horne <shorne@...il.com>
Cc:     Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        linux@...ck-us.net, openrisc@...ts.librecores.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 10/25] openrisc: add spinlock implementation

On Wed, Feb 22, 2017 at 04:11:39AM +0900, Stafford Horne wrote:
> +static inline void arch_spin_unlock(arch_spinlock_t *lock)
> +{
> +	smp_mb();
> +	lock->tickets.owner++;
> +}

This is putting a lot of trust in the compiler, nothing is volatile so
it can do horrible things.