From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 1/3] ARM: Introduce atomic MMIO modify
Date: Fri, 6 Sep 2013 10:48:44 -0600 [thread overview]
Message-ID: <20130906164844.GA2308@obsidianresearch.com> (raw)
In-Reply-To: <20130905090841.GA9696@mudshark.cambridge.arm.com>
On Thu, Sep 05, 2013 at 10:08:42AM +0100, Will Deacon wrote:
> > I would like to make the things move on about this subject. Should it
> > be possible to merge this version of the patch set? Currently the
> > only users of this new API are drivers for ARM SoCs.
>
> In the short term then, I'd keep this restricted to ARM. Without relaxed
> accessors available across all architectures, I don't think we can make this
> usefully generic (a readX/writeX version would be horribly slow on ARM).
Realistically though, the current use cases for this function have it
called only a few times during startup, so it 'horribly slow' isn't
really important at all.
So why not start with this in generic headers:
extern void atomic_io_modify(void __iomem *reg, u32 mask, u32 set);
#define atomic_io_modify_relaxed atomic_io_modify
And the relaxed optimization can come along in due course?
Jason
next prev parent reply other threads:[~2013-09-06 16:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-23 10:24 [PATCH v3 0/3] Introduce atomic MMIO register modify Ezequiel Garcia
2013-08-23 10:24 ` [PATCH v3 1/3] ARM: Introduce atomic MMIO modify Ezequiel Garcia
2013-08-23 10:38 ` Baruch Siach
2013-08-23 11:07 ` Ezequiel Garcia
2013-08-23 11:32 ` Ezequiel Garcia
2013-08-23 11:48 ` Catalin Marinas
2013-08-30 9:08 ` Will Deacon
2013-08-30 9:15 ` Catalin Marinas
2013-08-30 9:20 ` Will Deacon
2013-08-30 10:03 ` Catalin Marinas
2013-08-30 20:08 ` Jason Gunthorpe
2013-08-30 22:18 ` Russell King - ARM Linux
2013-09-05 8:59 ` Gregory CLEMENT
2013-09-05 9:08 ` Will Deacon
2013-09-05 9:20 ` Gregory CLEMENT
2013-09-06 16:48 ` Jason Gunthorpe [this message]
2013-08-23 11:28 ` Ezequiel Garcia
2013-08-23 10:24 ` [PATCH v3 2/3] clocksource: orion: Use atomic access for shared registers Ezequiel Garcia
2013-08-23 10:38 ` Baruch Siach
2013-08-23 10:49 ` Ezequiel Garcia
2013-08-23 10:24 ` [PATCH v3 3/3] watchdog: " Ezequiel Garcia
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