linux-kernel - Re: Traceback with CONFIG_REGMAP_KUNIT=y+CONFIG_DEBUG_ATOMIC

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Message-ID: <12e6144c-0d24-4556-beef-d754273992e4@sirena.org.uk>
Date:   Thu, 20 Jul 2023 16:07:41 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Dan Carpenter <dan.carpenter@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: Traceback with CONFIG_REGMAP_KUNIT=y+CONFIG_DEBUG_ATOMIC_SLEEP=y

On Thu, Jul 20, 2023 at 08:03:13AM -0700, Guenter Roeck wrote:
> On 7/20/23 07:31, Mark Brown wrote:

> > They're both independently fine, but I wouldn't expect anything that's
> > running in atomic context to be actually using dynamic allocations.

> Which one do you prefer ? As I mentioned in my second patch, there are
> two drivers which use fast_io together with REGCACHE_RBTREE and thus
> are likely affected by this problem. Dan's solution would cover that,
> while my current RFC patch would likely cause those drivers to fail.
> Plus, of course, they could get stuck if they actually end up trying to
> sleep while allocating memory.

Like I say I don't think it's an either/or - we can do both
independently, they both make sense standalone and don't conflict with
each other.

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