[ARM] Fix FIQ issue with ARM926

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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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Russell King 2007-10-27 11:01:35 +01:00 • committed by Russell King

parent d8cb70d10a

commit 0214f9221a

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arch/arm/mm/proc-arm926.S

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