linux-kernel - Re: [PATCH 01/18] block/rnbd: fix mixed module-builtin object

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Message-ID: <CAK7LNAT_PuL0vuYaPxKZ3AfrojBC2tEXUA7Gqs2VuVuoTVoXmQ@mail.gmail.com>
Date:   Tue, 22 Nov 2022 14:59:28 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Andrew Davis <afd@...com>
Cc:     Alexander Lobakin <alobakin@...me>, linux-kbuild@...r.kernel.org,
        Nicolas Schier <nicolas@...sle.eu>,
        Jens Axboe <axboe@...nel.dk>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Derek Chickles <dchickles@...vell.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Daniel Scally <djrscally@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        NXP Linux Team <linux-imx@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/18] block/rnbd: fix mixed module-builtin object

On Tue, Nov 22, 2022 at 6:18 AM Andrew Davis <afd@...com> wrote:
>
> On 11/19/22 5:04 PM, Alexander Lobakin wrote:
> > From: Masahiro Yamada <masahiroy@...nel.org>
> >
> > With CONFIG_BLK_DEV_RNBD_CLIENT=m and CONFIG_BLK_DEV_RNBD_SERVER=y
> > (or vice versa), rnbd-common.o is linked to a module and also to
> > vmlinux even though CFLAGS are different between builtins and modules.
> >
> > This is the same situation as fixed by commit 637a642f5ca5 ("zstd:
> > Fixing mixed module-builtin objects").
> >
> > Turn rnbd_access_mode_str() into an inline function.
> >
>
> Why inline? All you should need is "static" to keep these internal to
> each compilation unit. Inline also bloats the object files when the
> function is called from multiple places. Let the compiler decide when
> to inline.
>
> Andrew


Since it is a header file.


In header files, "static inline" should be always used.
Never "static".


If a header is included from a C file and there is a function
that is not used from that C file,
"static" would emit -Wunused-function warning
(-Wunused-function is enabled by -Wall, which is the case
for the kernel build).





-- 
Best Regards
Masahiro Yamada