linux-kernel - Re: [PATCH 3/8] kcsan: Skew delay to be longer for certain access types

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Message-ID: <20200721140523.GA10769@hirez.programming.kicks-ass.net>
Date:   Tue, 21 Jul 2020 16:05:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marco Elver <elver@...gle.com>
Cc:     paulmck@...nel.org, will@...nel.org, arnd@...db.de,
        mark.rutland@....com, dvyukov@...gle.com, glider@...gle.com,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 3/8] kcsan: Skew delay to be longer for certain access
 types

On Tue, Jul 21, 2020 at 12:30:11PM +0200, Marco Elver wrote:
> For compound instrumentation and assert accesses, skew the watchpoint
> delay to be longer. We still shouldn't exceed the maximum delays, but it
> is safe to skew the delay for these accesses.

Complete lack of actual justification.. *why* are you doing this, and
*why* is it safe etc..