From: Natalie Protasevich Date: Thu, 23 Jun 2005 07:08:29 +0000 (-0700) Subject: [PATCH] x86: avoid wasting IRQs for PCI devices X-Git-Tag: v2.6.13-rc1~68^2~490 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c434b7a6aedfe428ad17cd61b21b125a7b7a29ce;p=pandora-kernel.git [PATCH] x86: avoid wasting IRQs for PCI devices I have submitted the patch for x86_64, this is submission for i386. The patch changes the way IRQs are handed out to PCI devices. Currently, each I/O APIC pin gets associated with an IRQ, no matter if the pin is used or not. This imposes severe limitation on systems that have designs that employ many I/O APICs, only utilizing couple lines of each, such as P64H2 chipset. It is used in ES7000, and currently, there is no way to boot the system with more that 9 I/O APICs. The simple change below allows to boot a system with say 64 (or more) I/O APICs, each providing 1 slot, which otherwise impossible because of the IRQ gaps created for unused lines on each I/O APIC. It does not resolve the problem with number of devices that exceeds number of possible IRQs, but eases up a tension for IRQs on any large system with potentually large number of devices. Signed-off-by: Natalie Protasevich Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed