linux-kernel - Re: [PATCH/RFC] module: replace module_layout with module

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Date:   Mon, 23 Jan 2023 07:57:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     Song Liu <song@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        songliubraving@...com, Peter Zijlstra <peterz@...radead.org>,
        linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC] module: replace module_layout with module_memory

On Fri, Jan 20, 2023 at 09:42:26AM -0800, Song Liu wrote:
> So here are the two versions, both with secondary addr_[min|max] for
> CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC.
> 
> v2. Just use mod_mem array:
> https://git.kernel.org/pub/scm/linux/kernel/git/song/md.git/commit/?h=remotes/song-md/new_module_alloc_build_test_v2
> 
> v3. mod_mem array and the defines:
> #define mod_core_text mod_mem[MOD_MEM_TYPE_TEXT]
> #define mod_core_data mod_mem[MOD_MEM_TYPE_DATA]
> etc.
> https://git.kernel.org/pub/scm/linux/kernel/git/song/md.git/commit/?h=remotes/song-md/new_module_alloc_build_test_v3

I find v2 much preferably.  Having magic layouts with different
access methods is horribly confusing.  It might be a way changes
things if modifying every caller would be intrusive, but starting
out that way does not seem like a very good idea.