From: Suresh Siddha Date: Tue, 1 Dec 2009 23:31:17 +0000 (-0800) Subject: x86, ioapic: Document another case when level irq is seen as an edge X-Git-Tag: v2.6.33-rc1~397^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c83995b6c7c6bb795bce80f75fbffb15f78db2d;p=pandora-kernel.git x86, ioapic: Document another case when level irq is seen as an edge In the case when cpu goes offline, fixup_irqs() will forward any unhandled interrupt on the offlined cpu to the new cpu destination that is handling the corresponding interrupt. This interrupt forwarding is done via IPI's. Hence, in this case also level-triggered io-apic interrupt will be seen as an edge interrupt in the cpu's APIC IRR. Document this scenario in the code which handles this case by doing an explicit EOI to the io-apic to clear remote IRR of the io-apic RTE. Requested-by: Maciej W. Rozycki Signed-off-by: Suresh Siddha Cc: Maciej W. Rozycki Cc: ebiederm@xmission.com Cc: garyhade@us.ibm.com LKML-Reference: <20091201233335.143970505@sbs-t61.sc.intel.com> Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed