linux-kernel - Re: [PATCH] x86: mark some mpspec inline functions as _

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Date:   Fri, 26 Feb 2021 14:24:21 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] x86: mark some mpspec inline functions as __init

On Fri, Feb 26, 2021 at 9:13 AM Borislav Petkov <bp@...en8.de> wrote:
>
> On Thu, Feb 25, 2021 at 01:58:48PM -0800, Nick Desaulniers wrote:
> > The config that reproduces it wasn't shared here; I wouldn't be
> > surprised if this was found via randconfig that enabled some config
> > that led to excessive code bloat somewhere somehow.
>
> I'm sceptical it is the .config. As I said, those single function calls
> which I could replace by hand - the wrappers simply make the code
> cleaner. They could just as well be macros FWIW and then the inlining
> will be practically forced at preprocess time.

I managed to track down the configurations: This particular function is
not inlined whenever CONFIG_UBSAN_OBJECT_SIZE is enabled
and CONFIG_UBSAN_TRAP is disabled, plus obviously any
configuration option that is needed to build the file.

     Arnd