From: linux@armlinux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 1/3] asm-generic: io: Add exec versions of ioremap
Date: Wed, 18 May 2016 21:57:59 +0100 [thread overview]
Message-ID: <20160518205758.GY5783@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <3861017.ZJOlWYvEFT@wuerfel>
On Wed, May 18, 2016 at 10:25:03PM +0200, Arnd Bergmann wrote:
> The ARM version of ioremap_exec() that gets added in this patch is cached
> (like memremap()), but then the asm-generic version is not? This is
> even more confusing, it should at least do roughly the same thing across
> architectures.
>
> There should also be some documentation about what the expected behavior is, e.g.:
>
> - is memremap_exec() by default cached or not? (I assume it would
> be like memremap())
> - If we have an interface that does explicit uncached executable mapping,
> what about architectures on which this is not possible? Should they
> fall back to cached or non-executable, or cause a link error?
Another important point is whether atomic instructions / kernel locks
can be located within the mapped memory.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
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next prev parent reply other threads:[~2016-05-18 20:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-09 21:41 [RFC PATCH 0/3] Add ioremap_exec and extend drivers/misc/sram.c Dave Gerlach
2016-05-09 21:41 ` [RFC PATCH 1/3] asm-generic: io: Add exec versions of ioremap Dave Gerlach
2016-05-12 16:37 ` Russell King - ARM Linux
2016-05-18 14:12 ` Dave Gerlach
2016-05-18 17:51 ` Russell King - ARM Linux
2016-05-18 20:25 ` Arnd Bergmann
2016-05-18 20:57 ` Russell King - ARM Linux [this message]
2016-05-25 15:45 ` Dave Gerlach
2016-05-09 21:41 ` [RFC PATCH 2/3] lib: devres: Add exec and exec_nocache versions of devm_ioremap Dave Gerlach
2016-05-09 21:41 ` [RFC PATCH 3/3] misc: SRAM: Add option to map SRAM to allow code execution Dave Gerlach
2016-05-12 16:30 ` [RFC PATCH 0/3] Add ioremap_exec and extend drivers/misc/sram.c Tony Lindgren
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