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

[Mark Brown]

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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