linux-kernel - Re: [PATCH v6 06/13] module: Move strict rwx support to a separate file

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Message-ID: <CANfR36ja_NYoBFYOAO02a4LOp_wDzD=8NVqhCY0PEOXC3-dsvg@mail.gmail.com>
Date:   Mon, 21 Feb 2022 09:35:03 +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>,
        "joe@...ches.com" <joe@...ches.com>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>
Subject: Re: [PATCH v6 06/13] module: Move strict rwx support to a separate file

On Mon 2022-02-21 06:31 +0000, Christophe Leroy wrote:
>    CC      kernel/module/strict_rwx.o
> In file included from ./include/linux/build_bug.h:5,
>                   from ./include/linux/container_of.h:5,
>                   from ./include/linux/list.h:5,
>                   from ./include/linux/module.h:12,
>                   from kernel/module/strict_rwx.c:8:
> kernel/module/strict_rwx.c: In function 'frob_rodata':
> kernel/module/strict_rwx.c:16:17: error: implicit declaration of
> function 'PAGE_ALIGNED'; did you mean 'IS_ALIGNED'?
> [-Werror=implicit-function-declaration]
>     16 |         BUG_ON(!PAGE_ALIGNED(layout->base));
>        |                 ^~~~~~~~~~~~
> ./include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
>     78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
>        |                                             ^
> kernel/module/strict_rwx.c:16:9: note: in expansion of macro 'BUG_ON'
>     16 |         BUG_ON(!PAGE_ALIGNED(layout->base));
>        |         ^~~~~~
> cc1: some warnings being treated as errors
> make[2]: *** [scripts/Makefile.build:288 : kernel/module/strict_rwx.o]
> Erreur 1
>
>
>
> You have to include <linux/mm.h>

Christophe,

Strange, I have not seen this before. Locally, looking at
kernel/module/strict_rwx.i it is eventually included. Anyhow, you are
right. Also, it will not hurt due to the multiple-include optimisation
found in include/linux/mm.h.


Kind regards,

-- 
Aaron Tomlin