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

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Message-ID: <CAFP8O3KEqSsknL7YwvAhXLu=R6GHR4=SB_Fix0=rR8KiwBKSnA@mail.gmail.com>
Date:   Mon, 7 Jun 2021 11:27:27 -0700
From:   Fāng-ruì Sòng <maskray@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>, lma@...ihalf.com,
        Guenter Roeck <groeck@...gle.com>,
        Juergen Gross <jgross@...e.com>, 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>,
        Nathan Chancellor <nathan@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH v3 16/16] objtool,x86: Rewrite retpoline thunk calls

On Mon, Jun 7, 2021 at 11:19 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Sat, Jun 05, 2021 at 06:58:39PM -0700, Fāng-ruì Sòng wrote:
>
> > You may use https://github.com/llvm/llvm-project/blob/main/llvm/tools/llvm-objcopy/ELF/Object.cpp#L843
> > as a reference.
>
> BTW, Error::success(), is that a successfull error, or an erroneous
> success? :-))

A success (no error). Error::success() is a factory member function.
Its purpose is to create an "unchecked" Error instance and require the
caller to explicitly check for the error state.