From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Sat, 27 Oct 2007 10:01:35 +0000 (+0100)
Subject: [ARM] Fix FIQ issue with ARM926
X-Git-Tag: v2.6.24-rc2~64^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0214f9221aa06fba35c0cd5c80641b0fcfcb1cbe;p=pandora-kernel.git

[ARM] Fix FIQ issue with ARM926

Jon Eibertzon writes:
> We have noticed that the I-cache is disabled while waiting for
> interrupt in cpu_arm926_do_idle in arch/arm/mm/proc-arm926.S
> and we are curious to know why, because this causes us a great
> performance hit when executing in FIQ-handlers. Is it assumed
> here that every individual FIQ-handler re-enables the I-cache?

The I-cache disable is an errata workaround, so the solution is to
disable FIQs across the section with the I-cache disabled.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

Reading git-diff-tree failed