From: Changbin Du <changbin.du@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
Changbin Du <changbin.du@gmail.com>,
Randy Dunlap <rdunlap@infradead.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Linux-Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Hans de Goede <hdegoede@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: linux-next: Tree for Oct 31 (vboxguest)
Date: Fri, 2 Nov 2018 23:59:33 +0000 [thread overview]
Message-ID: <20181102235731.smqhskmxv5mu43qq@mail.google.com> (raw)
In-Reply-To: <CAK8P3a1w8p8OC-9_0mtMUxEojvyVfXvF8Ka4J7TnoyZ=gr2Fow@mail.gmail.com>
On Fri, Nov 02, 2018 at 04:54:25PM +0100, Arnd Bergmann wrote:
> On 11/2/18, Masahiro Yamada <yamada.masahiro@socionext.com> wrote:
> > On Thu, Nov 1, 2018 at 11:32 PM Changbin Du <changbin.du@gmail.com> wrote:
> >> On Thu, Nov 01, 2018 at 12:32:48PM +0900, Masahiro Yamada wrote:
> >
> > How about clang?
> >
> > For clang, -Og might be equivalent to -O1 at this moment, but I am not
> > sure.
> >
> > In my understanding, Clang does not inline functions marked with 'static
> > inline'
> > for -Og (or -O1) optimization level.
> >
> > Theoretically, 'inline' keyword is a just hint for the compiler, after all.
>
> I think this means that we cannot build the kernel in that configuration,
> at least with CONFIG_OPTIMIZE_INLINING=y. Without that option,
> every 'inline' becomes 'always_inline'.
>
> Arnd
I have verified the new configuration with GCC. CONFIG_OPTIMIZE_INLINING is a
whole different thing and I dont think it is so aggressive. Because many of
kernel functions marked as 'inline' must be inlined. Otherwise the kernel cannot
be compiled at all with CONFIG_OPTIMIZE_INLINING=y. If you wanna to try, just
remove the 'inline' keyword from some kernel functions to see what happens.
--
Thanks,
Changbin Du
next prev parent reply other threads:[~2018-11-02 23:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-31 3:59 linux-next: Tree for Oct 31 Stephen Rothwell
2018-10-31 15:51 ` linux-next: Tree for Oct 31 (vboxguest) Randy Dunlap
2018-10-31 16:50 ` Hans de Goede
2018-10-31 19:06 ` Randy Dunlap
2018-10-31 21:41 ` Arnd Bergmann
2018-10-31 21:45 ` Randy Dunlap
2018-11-01 3:32 ` Masahiro Yamada
2018-11-01 14:29 ` Changbin Du
2018-11-02 8:25 ` Masahiro Yamada
2018-11-02 15:54 ` Arnd Bergmann
2018-11-02 23:59 ` Changbin Du [this message]
2018-11-04 2:43 ` Masahiro Yamada
2018-11-04 23:38 ` Changbin Du
2018-11-05 3:00 ` Masahiro Yamada
2018-11-02 23:59 ` Changbin Du
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