linux-kernel - Re: [PATCH v4 0/4] Properly handle module

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Message-ID: <2025040804-ambiguous-monorail-53ff@gregkh>
Date: Tue, 8 Apr 2025 21:21:19 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Shyam Saini <shyamsaini@...ux.microsoft.com>
Cc: Petr Pavlu <petr.pavlu@...e.com>, linux-kernel@...r.kernel.org,
	linux-modules@...r.kernel.org, code@...icks.com,
	linux@...musvillemoes.dk, christophe.leroy@...roup.eu,
	hch@...radead.org, mcgrof@...nel.org, frkaya@...ux.microsoft.com,
	vijayb@...ux.microsoft.com, linux@...ssschuh.net,
	samitolvanen@...gle.com, da.gomez@...sung.com, rafael@...nel.org,
	dakr@...nel.org
Subject: Re: [PATCH v4 0/4] Properly handle module_kobject creation

On Tue, Apr 08, 2025 at 12:19:22PM -0700, Shyam Saini wrote:
> Hi Greg,
> 
> > On 2/27/25 19:49, Shyam Saini wrote:
> > > Hi Everyone,
> > > 
> > > This patch series fixes handling of module_kobject creation.
> > > A driver expect module_kset list populated with its corresponding
> > > module_kobject to create its /sys/module/<built-in-module>/drivers
> > > directory.
> > > 
> > > Since,
> > > [1] commit 96a1a2412acb ("kernel/params.c: defer most of param_sysfs_init() to late_initcall time")
> > > Call to populate module_kset list is deferred to save init time so that
> > > external watchdog doesn't fireup on some boards and Linux can take
> > > responsibility of feeding watchdog before it spuriously resets the
> > > system. However, [1] this fix caused another issue i.e, consumers
> > > of module_kset can't get related module_kobject during driver
> > > initialisation and hence can't create their
> > > /sys/module/<built-in-module>/drivers directory.
> > > 
> > > Consequently, [1] breaks user-space applications for eg: DPDK, which
> > > expects /sys/module/vfio_pci/drivers/pci:vfio-pci/new_id to be present.
> > > 
> > > The second issue was reported and the [2] revert of [1] was
> > > proposed. However, [2] the Revert doesn't address the original issue
> > > reported in [1].
> > > 
> > > This patch series addresses both issues reported in [1] and [2].
> > > 
> > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96a1a2412acb
> > > [2] https://lore.kernel.org/lkml/20250130225803.321004-1-shyamsaini@linux.microsoft.com/
> > 
> > This looks ok to me. I only think the Fixes: tag should have remained
> > solely on the last patch in the series as that is the actual fix. I'll
> > adjust it when picking up the patches.
> > 
> > I'm going to wait for a few days if others still would like to comment
> > and then plan to queue this on modules-next.
> > 
> > @Greg, could I please get an Acked-by from you on the last patch in the
> > series as this affects the code in the driver core?
> > 
> 
> sorry for the frequent pings, could you please Ack last patch of this series
> or perhaps provide any feedback ?

The merge window _just_ ended, please give us a chance to catch up...