From: skannan@codeaurora.org (Saravana Kannan)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2] [ARM] Add ARCH_PROVIDES_UDELAY config option
Date: Thu, 27 May 2010 17:41:14 -0700 [thread overview]
Message-ID: <4BFF112A.2060700@codeaurora.org> (raw)
In-Reply-To: <20100521220653.GL11042@n2100.arm.linux.org.uk>
Russell King - ARM Linux wrote:
> My point is not specific to sched_clock, but to counters which on ARM
> are 99.9% always memory mapped, and therefore inaccessible during the
> very early kernel boot. sched_clock was merely an illustration of the
> problem.
Do you know any code which uses udelay that early? I can't imagine any
non-driver code using udelay. If it's just drivers using udelay, then
they need IO mapping to have been completed for the device register
access to work and hence udelay won't have any problems.
-Saravana
next prev parent reply other threads:[~2010-05-28 0:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-30 19:12 [PATCH V2] [ARM] Add ARCH_PROVIDES_UDELAY config option Colin Cross
2010-04-30 19:37 ` Colin Cross
2010-04-30 22:11 ` Kevin Hilman
2010-05-01 0:04 ` Saravana Kannan
2010-05-01 10:01 ` Russell King - ARM Linux
2010-05-21 22:01 ` Saravana Kannan
2010-05-21 22:06 ` Russell King - ARM Linux
2010-05-21 22:10 ` Saravana Kannan
2010-05-28 0:41 ` Saravana Kannan [this message]
2010-06-22 1:14 ` Saravana Kannan
2010-06-28 2:30 ` Colin Cross
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