linux-kernel - Re: [PATCH 12/18] mtd: tests: fix object shared between several modules

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Date:   Thu, 24 Nov 2022 12:31:24 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Alexander Lobakin <alobakin@...me>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/18] mtd: tests: fix object shared between several
 modules

Hello,

Reducing the Cc list.

miquel.raynal@...tlin.com wrote on Wed, 23 Nov 2022 17:59:00 +0100:

> Hi,
> 
> masahiroy@...nel.org wrote on Wed, 23 Nov 2022 22:11:49 +0900:
> 
> > On Sun, Nov 20, 2022 at 8:08 AM Alexander Lobakin <alobakin@...me> wrote:  
> > >
> > > mtd_test.o is linked to 8(!) different test modules:
> > >    
> > > > scripts/Makefile.build:252: ./drivers/mtd/tests/Makefile: mtd_test.o
> > > > is added to multiple modules: mtd_nandbiterrs mtd_oobtest mtd_pagetest
> > > > mtd_readtest mtd_speedtest mtd_stresstest mtd_subpagetest mtd_torturetest    
> > >
> > > Although all of them share one Kconfig option
> > > (CONFIG_MTD_TESTS), it's better to not link one object file into
> > > several modules (and/or vmlinux).
> > > Under certain circumstances, such can lead to the situation fixed by
> > > commit 637a642f5ca5 ("zstd: Fixing mixed module-builtin objects").
> > > In this particular case, there's also no need to duplicate the very
> > > same object code 8 times.
> > >
> > > Convert mtd_test.o to a standalone module which will export its
> > > functions to the rest.
> > >
> > > Fixes: a995c792280d ("mtd: tests: rename sources in order to link a helper object")
> > > Suggested-by: Masahiro Yamada <masahiroy@...nel.org>    
> > 
> > IMHO, Reported-by might be a better fit.
> > 
> > 
> > I think they can become static inline functions in mtd_test.h
> > (at least, mtdtest_relax() is a static inline there), but I am not sure.
> > 
> > Please send this to the MTD list, and consult the maintainer(s).  
> 
> TBH I don't really mind. These are test modules that you insert to
> harden and profile the stack, so whatever makes the robots happy is
> fine. Anyway, they are being slowly replaced by userspace tools so we
> might eventually get rid of them.

Once you feel ready, if you want this to be merged through the mtd
tree, you can resend with the linux-mtd ML in Cc, otherwise if falls out
of the scope of the tools and it's a pain to collect.

Thanks,
Miquèl