linux-kernel - Re: [PATCH v2 03/24] objtool: Handle __sanitize

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Date:   Mon, 28 Jun 2021 11:07:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marco Elver <elver@...gle.com>
Cc:     jpoimboe@...hat.com, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, joro@...tes.org,
        boris.ostrovsky@...cle.com, jgross@...e.com, x86@...nel.org,
        mbenes@...e.com, rostedt@...dmis.org, dvyukov@...gle.com
Subject: Re: [PATCH v2 03/24] objtool: Handle __sanitize_cov*() tail calls

On Fri, Jun 25, 2021 at 01:05:39PM +0200, Marco Elver wrote:
> On Thu, Jun 24, 2021 at 11:41AM +0200, Peter Zijlstra wrote:
> > Turns out the compilers also generate tail calls to __sanitize_cov*(),
> > make sure to also patch those out in noinstr code.
> > 
> > Fixes: 0f1441b44e82 ("objtool: Fix noinstr vs KCOV")
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> Acked-by: Marco Elver <elver@...gle.com>
> 
> Thanks! More reason to not even try to do the same for other
> architectures, and the compiler needing the attribute...

Agreed!