linux-kernel - Re: [PATCH v7 1/3] revocable: Revocable resource management

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Message-ID: <20260116160424.GA14499@pendragon.ideasonboard.com>
Date: Fri, 16 Jan 2026 18:04:24 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Bartosz Golaszewski <brgl@...nel.org>
Cc: Danilo Krummrich <dakr@...nel.org>, Tzung-Bi Shih <tzungbi@...nel.org>,
	Benson Leung <bleung@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Linus Walleij <linusw@...nel.org>, Jonathan Corbet <corbet@....net>,
	Shuah Khan <shuah@...nel.org>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
	linux-kselftest@...r.kernel.org,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Dan Williams <dan.j.williams@...el.com>,
	Jason Gunthorpe <jgg@...dia.com>, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v7 1/3] revocable: Revocable resource management

On Fri, Jan 16, 2026 at 04:27:27PM +0100, Bartosz Golaszewski wrote:
> On Fri, Jan 16, 2026 at 4:20 PM Danilo Krummrich wrote:
> > On Fri Jan 16, 2026 at 9:02 AM CET, Tzung-Bi Shih wrote:
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index a671e3d4e8be..fd683c62012a 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -22517,6 +22517,13 @@ F:   include/uapi/linux/rseq.h
> > >  F:   kernel/rseq.c
> > >  F:   tools/testing/selftests/rseq/
> > >
> > > +REVOCABLE RESOURCE MANAGEMENT
> > > +M:   Tzung-Bi Shih <tzungbi@...nel.org>
> > > +L:   linux-kernel@...r.kernel.org
> > > +S:   Maintained
> > > +F:   drivers/base/revocable.c
> > > +F:   include/linux/revocable.h
> >
> > NIT: I think we should add this include to the DRIVER CORE entry as well.
> 
> FWIW: I'm not even sure drivers/base/ is the right place for this.
> Except for a few devm_ helpers, nothing here is inherently tied into
> the driver model This could be useful outside of device drivers and I
> would suggest to put it under lib/ with devres factored out into a
> separate source file.

I agree. Based on the discussions we had at LPC, the revocable resource
management API is not the right solution to handle races between device
removal and userspace access. It is however a possibly useful tool for
races between producers and consumers *inside the kernel*. lib/ is a
better location.

-- 
Regards,

Laurent Pinchart