From: ezequiel.garcia@free-electrons.com (Ezequiel Garcia)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 1/3] ARM: Introduce atomic MMIO modify
Date: Wed, 11 Dec 2013 17:49:43 -0300 [thread overview]
Message-ID: <20131211204942.GF5461@localhost> (raw)
In-Reply-To: <20131210170025.GA4360@n2100.arm.linux.org.uk>
On Tue, Dec 10, 2013 at 05:00:25PM +0000, Russell King - ARM Linux wrote:
> On Tue, Dec 10, 2013 at 04:49:07PM +0000, Mark Brown wrote:
> > On Tue, Dec 10, 2013 at 11:41:35AM -0300, Ezequiel Garcia wrote:
> >
> > > +void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set)
> > > +{
> > > + unsigned long flags;
> > > + u32 value;
> > > +
> > > + raw_spin_lock_irqsave(&__io_lock, flags);
> > > + value = readl_relaxed(reg) & ~mask;
> > > + value |= (set & mask);
> > > + writel_relaxed(value, reg);
> > > + raw_spin_unlock_irqrestore(&__io_lock, flags);
> > > +}
> > > +EXPORT_SYMBOL(atomic_io_modify_relaxed);
> >
> > This looks quite generic - why is it in architecture specific code?
>
> because the _relaxed IO operators don't exist on other architectures, and
> there's been some discussion around whether they should with no conclusions
> being reached.
Exactly.
Will? Catalin? Any comments on this?
--
Ezequiel Garc?a, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
next prev parent reply other threads:[~2013-12-11 20:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-10 14:41 [PATCH v5 0/3] Introduce atomic MMIO register modify Ezequiel Garcia
2013-12-10 14:41 ` [PATCH v5 1/3] ARM: Introduce atomic MMIO modify Ezequiel Garcia
2013-12-10 16:49 ` Mark Brown
2013-12-10 17:00 ` Russell King - ARM Linux
2013-12-10 17:09 ` Mark Brown
2013-12-11 20:49 ` Ezequiel Garcia [this message]
2013-12-12 13:58 ` Will Deacon
2013-12-12 14:02 ` Jason Cooper
2013-12-12 14:07 ` Will Deacon
2013-12-12 14:36 ` Jason Cooper
2013-12-12 15:05 ` Ezequiel Garcia
2014-01-02 11:30 ` Russell King - ARM Linux
2014-01-02 14:47 ` Jason Cooper
2014-01-02 14:58 ` Ezequiel Garcia
2014-01-12 14:52 ` Ezequiel Garcia
2014-01-13 13:58 ` Catalin Marinas
2014-01-13 14:02 ` Russell King - ARM Linux
2014-01-13 15:28 ` Will Deacon
2014-01-15 17:15 ` Jason Cooper
2013-12-10 14:41 ` [PATCH v5 2/3] clocksource: orion: Use atomic access for shared registers Ezequiel Garcia
2013-12-12 13:53 ` Jason Cooper
2013-12-10 14:41 ` [PATCH v5 3/3] watchdog: " Ezequiel Garcia
2013-12-12 13:53 ` Jason Cooper
2013-12-12 13:52 ` [PATCH v5 0/3] Introduce atomic MMIO register modify Jason Cooper
2013-12-12 15:07 ` Ezequiel Garcia
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