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

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Message-ID: <1c90db79-4a1a-d3cb-5250-f30cf6b5a90c@roeck-us.net>
Date:   Fri, 21 Jul 2023 09:01:03 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mark Brown <broonie@...nel.org>
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>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [RFC PATCH 2/2] regmap: Reject fast_io regmap configurations with
 RBTREE and MAPLE caches

On 7/21/23 08:13, Mark Brown wrote:
> 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.

Ok.

Dan, let me know if you don't have time to send a proper patch.
I have one based on your suggestion prepared that I could send out
if needed.

Thanks,
Guenter