linux-kernel - Re: [PATCH v2] kernel/module.c: heuristic enhancement when INSTALL_MOD

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Date:   Thu, 23 Dec 2021 16:39:15 +0530
From:   Vimal Agrawal <avimalin@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Vimal Agrawal <vimal.Agrawal@...hos.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jan Beulich <JBeulich@...e.com>, Jeff Mahoney <jeffm@...e.com>,
        Sam Ravnborg <sam@...nborg.org>, linux-kbuild@...r.kernel.org,
        jeyu@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] kernel/module.c: heuristic enhancement when
 INSTALL_MOD_STRIP= "--strip-unneeded" is used

Hi Christoph,

On Thu, Dec 23, 2021 at 4:06 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> We never build modules with that ёption, so this is completely pointless.
>
we use openwrt for build and packaging and it has been using this
option for long.

kbuild documentation says the following for INSTALL_MOD_STRIP:
If this variable is specified, it will cause modules to be stripped
after they are installed. If INSTALL_MOD_STRIP is ‘1’, then the
default option –strip-debug will be used. Otherwise, the
INSTALL_MOD_STRIP value will be used as the option(s) to the strip
command.

So if kbuild does not support INSTALL_MOD_STRIP=--strip-unneeded
option then we should call out what it supports and should not even
allow what is not supported. We don't know what other options others
may be using but if we allow it then we should support it and it
should not behave erratic just because someone is using a
non-recommended option.

Vimal

> NAK.