linux-kernel - Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

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Message-ID: <20210609151126.GD68237@worktop.programming.kicks-ass.net>
Date:   Wed, 9 Jun 2021 17:11:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lukasz Majczak <lma@...ihalf.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Fāng-ruì Sòng <maskray@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Guenter Roeck <groeck@...gle.com>,
        Juergen Gross <jgross@...e.com>,
        Łukasz Bartosik <lb@...ihalf.com>,
        LKML <linux-kernel@...r.kernel.org>, mbenes@...e.com,
        Radosław Biernacki <rad@...ihalf.com>,
        upstream@...ihalf.com,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

On Wed, Jun 09, 2021 at 05:08:05PM +0200, Peter Zijlstra wrote:
> I wonder if the compiler will also generate conditional tail calls, and
> what that does with static_call... now I have to check all that.

OK.. static call patching infra will give us a nice WARN before it dies.