linux-kernel - Re: [PATCH v5 13/13] module: Move version support into a separate file

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Date:   Sun, 13 Feb 2022 18:03:36 +0000
From:   Aaron Tomlin <atomlin@...hat.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "cl@...ux.com" <cl@...ux.com>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "jeyu@...nel.org" <jeyu@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "atomlin@...mlin.com" <atomlin@...mlin.com>,
        "ghalat@...hat.com" <ghalat@...hat.com>,
        "allen.lkml@...il.com" <allen.lkml@...il.com>,
        "void@...ifault.com" <void@...ifault.com>,
        "joe@...ches.com" <joe@...ches.com>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>
Subject: Re: [PATCH v5 13/13] module: Move version support into a separate file

On Thu 2022-02-10 14:28 +0000, Christophe Leroy wrote:
>
>
> Le 09/02/2022 à 18:11, Aaron Tomlin a écrit :
> > No functional change.
> >
> > This patch migrates module version support out of core code into
> > kernel/module/version.c. In addition simple code refactoring to
> > make this possible.
> >
> > Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> > ---
> >   kernel/module/Makefile   |   1 +
> >   kernel/module/internal.h |  50 +++++++++++++
> >   kernel/module/main.c     | 150 +--------------------------------------
> >   kernel/module/version.c  | 110 ++++++++++++++++++++++++++++
> >   4 files changed, 163 insertions(+), 148 deletions(-)
> >   create mode 100644 kernel/module/version.c
>
> Sparse reports:
>
>    CHECK   kernel/module/version.c
> kernel/module/version.c:103:6: warning: symbol 'module_layout' was not
> declared. Should it be static?

The function module_layout() does not appear to be used. So, I've decided
to remove it.

> Checkpatch:
>
>     total: 0 errors, 2 warnings, 3 checks, 337 lines checked

Ok.

> > +struct symsearch {
> > +    const struct kernel_symbol *start, *stop;
> > +    const s32 *crcs;
> > +    enum mod_license {
> > +        NOT_GPL_ONLY,
> > +        GPL_ONLY,
> > +    } license;
> > +};
>
> Why don't leave this in main.c ?

Yes, struct 'symsearch' is not used outside of kernel/module/main.c.

> > +inline int check_modstruct_version(const struct load_info *info,
> > +                      struct module *mod)
>
> inline is pointless for a non static function

This was an unfortunate oversight.

> > +inline int same_magic(const char *amagic, const char *bmagic,
> > +                 bool has_crcs)
>
> Same, not point for inline keyword here.

Agreed.


Kind regards,

-- 
Aaron Tomlin