linux-kernel - Re: [PATCH 0/3] Revert "revocable: Revocable resource management"

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Message-ID: <aXpAScyRUuI3bH13@shikoro>
Date: Wed, 28 Jan 2026 17:58:49 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Bartosz Golaszewski <brgl@...nel.org>, Johan Hovold <johan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Danilo Krummrich <dakr@...nel.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Linus Walleij <linusw@...nel.org>, Jonathan Corbet <corbet@....net>,
	Shuah Khan <shuah@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Dan Williams <dan.j.williams@...el.com>, linux-doc@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
Subject: Re: [PATCH 0/3] Revert "revocable: Revocable resource management"


> I would just gently advise again that SRCU is not a pancea and should
> only be used if the read side sections are super performance
> critical. I'm not sure that describes I2C. rwsem is often a simpler
> and better choice.

You might be totally right. But in any case, we need to prepare the
subsystem first. That is where I am now. Next steps come after that.

> > [1] https://lkml.org/lkml/2021/1/20/999
> 
> Yeah, this was brought up a couple drafts of possible options were
> exchanged already but nothing was really focused on and polished.
> 
> It is a tricky problem to find a storage location for the lock and
> revoke so that the fops shim can access it while not disturbing the
> actual driver.

I can imagine. Thanks for the heads up, nice to see it was not
forgotten!


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