From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: disabling MMU of ARMv7-A
Date: Mon, 7 Apr 2014 11:33:12 +0100 [thread overview]
Message-ID: <20140407103312.GA7528@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20140407095629.GA3951@e103592.cambridge.arm.com>
On Mon, Apr 07, 2014 at 10:56:36AM +0100, Dave Martin wrote:
> Agreed -- CONFIG_MMU=n does not need to imply that the MMU is turned off:
> everything must be indentity-mapped (VA = PA), but it is still desirable
> to define attributes. For SMP, it's *necessary* to define attributes,
> otherwise we can't guarantee working spinlocks etc.
It's also necessary for UP as well, as the load-exclusive and
store-exclusive must still work. Remember these instructions get used
for more than just spinlocks.
--
FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly
improving, and getting towards what was expected from it.
next prev parent reply other threads:[~2014-04-07 10:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-28 7:15 disabling MMU of ARMv7-A Chanho Park
2014-03-28 7:23 ` Marc C
2014-03-28 7:27 ` Chanho Park
2014-03-28 10:49 ` Catalin Marinas
2014-03-28 10:43 ` Catalin Marinas
2014-04-07 9:56 ` Dave Martin
2014-04-07 10:33 ` Russell King - ARM Linux [this message]
2014-04-07 17:16 ` Dave Martin
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