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Date:   Mon, 30 Aug 2021 13:42:43 +0100
From:   Mark Brown <broonie@kernel.org>
To:     Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        Lee Jones <lee.jones@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>, Marc Zyngier <maz@kernel.org>,
        Hou Zhiqiang <Zhiqiang.Hou@nxp.com>,
        Biwen Li <biwen.li@nxp.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] regmap: teach regmap to use raw spinlocks if
 requested in the config
Message-ID: <YSzSQzDuWcrzSPtR@sirena.org.uk>
References: <20210825205041.927788-1-vladimir.oltean@nxp.com>
 <20210825205041.927788-2-vladimir.oltean@nxp.com>
 <875yvr3j5c.ffs@tglx>
 <19a98ebe-507b-d60e-47a3-9ffabfb24ca3@rasmusvillemoes.dk>
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On Mon, Aug 30, 2021 at 01:02:33PM +0200, Rasmus Villemoes wrote:

> i.e. the regmap code can actually do allocations under whatever internal
> lock it uses. So ISTM that any regmap that uses a raw_spinlock (whether
> unconditionally or via Vladimir's opt-in) cannot be used with
> regmap_bulk_write().

No, anything that's using a spinlock already needs to avoid any
allocations - ensuring that either there's no cache or that the
cache is fully initialized with defaults.  The only non-cache
allocations that might be done are only used by buses that sleep
anyway.

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