linux-kernel - Re: [PATCH net v3] net: Force inlining of checksum functions in net/checksum.h

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Message-ID: <20220218121237.GQ614@gate.crashing.org>
Date:   Fri, 18 Feb 2022 06:12:37 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     David Laight <David.Laight@...lab.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net v3] net: Force inlining of checksum functions in net/checksum.h

On Fri, Feb 18, 2022 at 10:35:48AM +0900, Masahiro Yamada wrote:
> On Fri, Feb 18, 2022 at 3:10 AM Segher Boessenkool
> <segher@...nel.crashing.org> wrote:
> > On Fri, Feb 18, 2022 at 02:27:16AM +0900, Masahiro Yamada wrote:
> > > On Fri, Feb 18, 2022 at 1:49 AM David Laight <David.Laight@...lab.com> wrote:
> > > > That description is largely fine.
> > > >
> > > > Inappropriate 'inline' ought to be removed.
> > > > Then 'inline' means - 'really do inline this'.
> > >
> > > You cannot change "static inline" to "static"
> > > in header files.
> >
> > Why not?  Those two have identical semantics!
> 
> e.g.)
> 
> 
> [1] Open  include/linux/device.h with your favorite editor,
>      then edit
> 
> static inline void *devm_kcalloc(struct device *dev,
> 
>     to
> 
> static void *devm_kcalloc(struct device *dev,
> 
> 
> [2] Build the kernel

You get some "defined but not used" warnings that are shushed for
inlines.  Do you see something else?

The semantics are the same.  Warnings are just warnings.  It builds
fine.


Segher