linux-kernel - Re: [PATCH 2/2] x86/unwind/orc: Silence warnings caused by missing ORC data

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Date:   Mon, 8 Feb 2021 13:56:18 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Ivan Babrou <ivan@...udflare.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 2/2] x86/unwind/orc: Silence warnings caused by missing
 ORC data

On Fri, Feb 05, 2021 at 08:24:03AM -0600, Josh Poimboeuf wrote:
> The ORC unwinder attempts to fall back to frame pointers when ORC data
> is missing for a given instruction.  It sets state->error, but then
> tries to keep going as a best-effort type of thing.  That may result in
> further warnings if the unwinder gets lost.
> 
> Until we have some way to register generated code with the unwinder,
> missing ORC will be expected, and occasionally going off the rails will
> also be expected.  So don't warn about it.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>

Cc: stable@...r.kernel.org

-- 
Josh