linux-kernel - Re: [PATCH 2/2] module: add support to avoid duplicates early on load

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Date:   Tue, 30 May 2023 15:45:23 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Johan Hovold <johan@...nel.org>
CC:     Luis Chamberlain <mcgrof@...nel.org>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Petr Pavlu <petr.pavlu@...e.com>, <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, <song@...nel.org>,
        <lucas.de.marchi@...il.com>, <christophe.leroy@...roup.eu>,
        <peterz@...radead.org>, <rppt@...nel.org>, <dave@...olabs.net>,
        <willy@...radead.org>, <vbabka@...e.cz>, <mhocko@...e.com>,
        <dave.hansen@...ux.intel.com>, <colin.i.king@...il.com>,
        <jim.cromie@...il.com>, <catalin.marinas@....com>,
        <jbaron@...mai.com>, <rick.p.edgecombe@...el.com>,
        <yujie.liu@...el.com>, <david@...hat.com>, <tglx@...utronix.de>,
        <hch@....de>, <patches@...ts.linux.dev>,
        <linux-modules@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <pmladek@...e.com>,
        <prarit@...hat.com>, <lennart@...ttering.net>
Subject: Re: [PATCH 2/2] module: add support to avoid duplicates early on load

Linus Torvalds wrote:
> On Mon, May 29, 2023 at 11:18 AM Johan Hovold <johan@...nel.org> wrote:
> >
> > I took a closer look at some of the modules that failed to load and
> > noticed a pattern in that they have dependencies that are needed by more
> > than one device.
> 
> Ok, this is a "maybe something like this" RFC series of two patches -
> one trivial one to re-organize things a bit so that we can then do the
> real one which uses a filter based on the inode pointer to return an
> "idempotent return value" for module loads that share the same inode.
> 
> It's entirely untested, and since I'm on the road I'm going to not
> really be able to test it. It compiles for me, and the code looks
> fairly straightforward, but it's probably buggy.

At least for me, these 2 patches, plus Johan's spinlock fixup, are:

Tested-by: Dan Williams <dan.j.williams@...el.com>

...on the test that was previously broken on plain v6.4-rc4. I have
these cherry picked on top of v6.4-rc4:

 Revert "module: error out early on concurrent load of the same module file"
 module: split up 'finit_module()' into init_module_from_file() helper
 modules: catch concurrent module loads, take two