linux-kernel - Re: objtool warning, branch, patch, and .config (GCC bug)

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Message-ID: <20220526080849.GF6479@worktop.programming.kicks-ass.net>
Date:   Thu, 26 May 2022 10:08:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-toolchains@...r.kernel.org
Subject: Re: objtool warning, branch, patch, and .config (GCC bug)

On Thu, May 26, 2022 at 10:03:13AM +0200, Peter Zijlstra wrote:

> Which is just bloody weird/broken if you ask me. What's worse, GCC-10
> does the same. Only when I use GCC-11 do I get sensible code again:

Just to clarify, I can reproduce using:

gcc-9 (Debian 9.4.0-5) 9.4.0
gcc-10 (Debian 10.3.0-15) 10.3.0

The good compiler is:

gcc-11 (Debian 11.3.0-1) 11.3.0