linux-kernel - Re: [PATCH v5 00/18] Rework READ

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Message-ID: <20200514122735.GW2978@hirez.programming.kicks-ass.net>
Date:   Thu, 14 May 2020 14:27:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will@...nel.org>
Cc:     Marco Elver <elver@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v5 00/18] Rework READ_ONCE() to improve codegen

On Thu, May 14, 2020 at 01:01:04PM +0100, Will Deacon wrote:

> > +#if __has_feature(undefined_sanitizer)
> 
> Hmm, this might want to be __has_feature(undefined_behavior_sanitizer)
> (and damn is that hard for a Brit to type out!)

(I know right, it should be behaviour, dammit!)

I tried without the condition, eg.:

+#define __no_sanitize_undefined \
+               __attribute__((no_sanitize("undefined")))

and it still generated UBSAN gunk.