linux-kernel - Re: [PATCH v2 6/8] modpost: Add modinfo flag to livepatch modules

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Date:   Mon, 18 Mar 2019 15:20:54 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Joao Moreira <jmoreira@...e.de>
Cc:     live-patching@...r.kernel.org, mbenes@...e.cz, pmladek@...e.cz,
        jikos@...e.cz, nstange@...e.de, jpoimboe@...hat.com,
        khlebnikov@...dex-team.ru, jeyu@...nel.org, matz@...e.de,
        linux-kernel@...r.kernel.org, yamada.masahiro@...ionext.com,
        linux-kbuild@...r.kernel.org, michal.lkml@...kovi.net
Subject: Re: [PATCH v2 6/8] modpost: Add modinfo flag to livepatch modules

On Fri, Mar 01, 2019 at 11:13:11AM -0300, Joao Moreira wrote:
> From: Miroslav Benes <mbenes@...e.cz>
> 
> Currently, livepatch infrastructure in the kernel relies on
> MODULE_INFO(livepatch, "Y") statement in a livepatch module. Then the
> kernel module loader knows a module is indeed livepatch module and can
> behave accordingly.
> 
> klp-convert, on the other hand relies on LIVEPATCH_* statement in the
> module's Makefile for exactly the same reason.
> 
> Remove dependency on modinfo and generate MODULE_INFO flag
> automatically in modpost when LIVEPATCH_* is defined in the module's
> Makefile. Generate a list of all built livepatch modules based on
> the .livepatch file and store it in (MODVERDIR)/livepatchmods. Give
> this list as an argument for modpost which will use it to identify
> livepatch modules.
> 
> As MODULE_INFO is no longer needed, remove it.
> 
> [jmoreira:
> * fix modpost.c (add_livepatch_flag) to update module structure with
> livepatch flag and prevent modpost from breaking due to unresolved
> symbols]
> 
> Signed-off-by: Miroslav Benes <mbenes@...e.cz>
> Signed-off-by: Joao Moreira <jmoreira@...e.de>
> ---
>  samples/livepatch/livepatch-sample.c |  1 -
>  scripts/Makefile.modpost             |  8 +++-
>  scripts/mod/modpost.c                | 84 +++++++++++++++++++++++++++++++++---
>  3 files changed, 85 insertions(+), 8 deletions(-)
> 
> [ ... snip ... ]

While we're here, we can make the same changes to all the other in-tree
livepatch self-test and sample modules:

  [squash] modpost/livepatch: apply modinfo flag to all in-tree livepatch modules
  https://github.com/torvalds/linux/commit/22c59f05c9618903a946d5f8f79bfa345d31de3c

-- Joe