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authorEric W. Biederman <ebiederm@xmission.com>2006-10-04 02:16:49 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 07:55:28 -0700
commit23d0b8b053391afe15c9667d80de77ca88e18b8b (patch)
tree8ee6dd027581f794bcbffaa9022a3635ba59b04a /include/asm-x86_64
parent323a01c50832749d23664954f91df6fc43e73975 (diff)
downloadop-kernel-dev-23d0b8b053391afe15c9667d80de77ca88e18b8b.zip
op-kernel-dev-23d0b8b053391afe15c9667d80de77ca88e18b8b.tar.gz
[PATCH] genirq: irq: generalize the check for HARDIRQ_BITS
This patch adds support for systems that cannot receive every interrupt on a single cpu simultaneously, in the check to see if we have enough HARDIRQ_BITS. MAX_HARDIRQS_PER_CPU becomes the count of the maximum number of hardare generated interrupts per cpu. On architectures that support per cpu interrupt delivery this can be a significant space savings and scalability bonus. This patch adds support for systems that cannot receive every interrupt on Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Rajesh Shah <rajesh.shah@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/hardirq.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-x86_64/hardirq.h b/include/asm-x86_64/hardirq.h
index 64a65ce..95d5e09 100644
--- a/include/asm-x86_64/hardirq.h
+++ b/include/asm-x86_64/hardirq.h
@@ -6,6 +6,9 @@
#include <asm/pda.h>
#include <asm/apic.h>
+/* We can have at most NR_VECTORS irqs routed to a cpu at a time */
+#define MAX_HARDIRQS_PER_CPU NR_VECTORS
+
#define __ARCH_IRQ_STAT 1
#define local_softirq_pending() read_pda(__softirq_pending)
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