Ingo Molnar ed5e233284 x86, voyager: fix ioremap_nocache() ... James Bottomley reported that the following commit: | commit 6371b49599 | Author: Ingo Molnar <mingo@elte.hu> | Date: Wed Jan 30 13:33:40 2008 +0100 | | x86: change ioremap() to default to uncached broke Voyager. James says: " it broke a class of voyager machines: those which rely on the quad interrupt controller (QIC). The precis of why they broke is because the QIC does IPIs (or CPIs in its terminology) via cache line interference: you interrupt a processor by moving a designated memory area to write exclusive in the cache (by simply writing to the line) and the CPU acks the interrupt by moving it back to read shared (by reading from it). That area, is, of course, mapped by ioremap, so reversing the ioremap semantics and adding the uncached bit completely breaks the QIC. " Sorry about that! Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2008-04-30 23:15:34 +02:00
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Makefile	…
setup.c	…
voyager_basic.c	…
voyager_cat.c	x86, voyager: fix ioremap_nocache()	2008-04-30 23:15:34 +02:00
voyager_smp.c	…
voyager_thread.c	…