linux-kernel - Re: [RFC] arm64: Enforce observed order for spinlock and data

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Date:   Tue, 4 Oct 2016 08:50:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     bdegraaf@...eaurora.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Timur Tabi <timur@...eaurora.org>,
        Nathan Lynch <nathan_lynch@...tor.com>,
        linux-kernel@...r.kernel.org,
        Christopher Covington <cov@...eaurora.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC] arm64: Enforce observed order for spinlock and data

On Mon, Oct 03, 2016 at 03:20:57PM -0400, bdegraaf@...eaurora.org wrote:
> Thinking about this, as the reader/writer code has no known "abuse"
> case, I'll remove it from the patchset, then provide a v2 patchset
> with a detailed explanation for the lockref problem using the commits
> you provided as an example, as well as performance consideration.

Please, fix lockref in those patches. Touching the spinlock because
lockref does something dubious really is the wrong thing.