linux-kernel - Re: [PATCH v2 3/5] kernel hacking: new config NO_AUTO_INLINE to disable compiler auto-inline optimizations

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Message-ID: <20180503130013.lcsem2xubk5jqmcg@intel.com>
Date:   Thu, 3 May 2018 21:00:13 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     changbin.du@...el.com,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] kernel hacking: new config NO_AUTO_INLINE to
 disable compiler auto-inline optimizations

On Wed, May 02, 2018 at 04:27:47PM -0400, Arnd Bergmann wrote:
> On Wed, May 2, 2018 at 9:44 AM,  <changbin.du@...el.com> wrote:
> > From: Changbin Du <changbin.du@...el.com>
> >
> > This patch add a new kernel hacking option NO_AUTO_INLINE. Selecting
> > this option will prevent the compiler from optimizing the kernel by
> > auto-inlining functions not marked with the inline keyword.
> >
> > With this option, only functions explicitly marked with "inline" will
> > be inlined. This will allow the function tracer to trace more functions
> > because it only traces functions that the compiler has not inlined.
> >
> > Signed-off-by: Changbin Du <changbin.du@...el.com>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> 
> Should this be closer to CONFIG_OPTIMIZE_INLINING or
> possibly mutually exclusive with it?
>
They are not related I think. CONFIG_OPTIMIZE_INLINING only has effect on
functions which are explicitly marked as inline.

>        Arnd

-- 
Thanks,
Changbin Du