linux-kernel - Re: [RFC PATCH 2/2] regmap: Reject fast_io regmap configurations with RBTREE and MAPLE caches

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Message-ID: <205a83df-c67b-457f-a9bf-a9c6def4bb3e@sirena.org.uk>
Date:   Fri, 21 Jul 2023 16:13:33 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        Andy Yan <andy.yan@...k-chips.com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [RFC PATCH 2/2] regmap: Reject fast_io regmap configurations
 with RBTREE and MAPLE caches

On Fri, Jul 21, 2023 at 08:07:28AM -0700, Guenter Roeck wrote:
> On 7/21/23 08:03, Mark Brown wrote:

> > Actually Guenter and Dan have made the required updates to support this
> > so the warning will be gone soon (hopefully Dan will send his patch
> > properly shortly).

> Do you plan to revert this patch ? If not regmap_init() would still fail
> for the affected drivers, even after my and Dan's patches have been applied.

Yeah.  You *can* use the dynamically allocating caches safely if you
ensure that no new cache nodes are allocated during I/O.  I'd not
realised people were actually doing this.

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