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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2007-10-27 11:01:35 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-10-31 15:21:40 +0000
commit0214f9221aa06fba35c0cd5c80641b0fcfcb1cbe (patch)
tree7cf9e67f6acec67b7e9d84768c8fc8821f636162 /usr
parentd8cb70d10a2d4e6b083b89044a68d860d0bf1eec (diff)
[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>
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