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

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Date:   Fri, 21 Jul 2023 16:03:08 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        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 04:53:42PM +0200, Marek Szyprowski wrote:

> This patch, which landed in today's linux-next, breaks operation of the 
> RockChip's VOP2 DRM driver 
> (drivers/gpu/drm/rockchip/rockchip_drm_vop2.c). I'm not sure what is the 
> proper fix in this case. Should one change the cache type to REGCACHE_FLAT?

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).

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