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
Date: Mon, 30 Aug 2021 13:42:43 +0100 [thread overview]
Message-ID: <YSzSQzDuWcrzSPtR@sirena.org.uk> (raw)
In-Reply-To: <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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next prev parent reply other threads:[~2021-08-30 12:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-25 20:50 [PATCH 0/2] Use raw spinlocks in the ls-extirq driver Vladimir Oltean
2021-08-25 20:50 ` [PATCH 1/2] regmap: teach regmap to use raw spinlocks if requested in the config Vladimir Oltean
2021-08-26 23:01 ` Thomas Gleixner
2021-08-27 16:12 ` Vladimir Oltean
2021-08-27 19:59 ` Thomas Gleixner
2021-08-30 10:49 ` Vladimir Oltean
2021-08-30 11:02 ` Rasmus Villemoes
2021-08-30 12:42 ` Mark Brown [this message]
2021-08-30 12:19 ` Mark Brown
2021-08-30 14:16 ` Thomas Gleixner
2021-09-01 16:05 ` Mark Brown
2021-09-02 8:35 ` Thomas Gleixner
2021-08-25 20:50 ` [PATCH 2/2] mfd: syscon: request a regmap with raw spinlocks for some devices Vladimir Oltean
2021-08-25 21:24 ` Arnd Bergmann
2021-08-25 22:00 ` Vladimir Oltean
2021-08-26 9:24 ` Arnd Bergmann
2021-08-26 13:57 ` Vladimir Oltean
2021-08-26 14:48 ` Arnd Bergmann
2021-09-06 9:18 ` Lee Jones
2021-08-26 12:51 ` (subset) [PATCH 0/2] Use raw spinlocks in the ls-extirq driver Mark Brown
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