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| author | Eric W. Biederman <ebiederm@xmission.com> | 2006-10-04 11:16:49 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-04 16:55:28 +0200 |
| commit | 23d0b8b053391afe15c9667d80de77ca88e18b8b (patch) | |
| tree | 8ee6dd027581f794bcbffaa9022a3635ba59b04a /include/asm-x86_64 | |
| parent | [PATCH] genirq: irq: remove msi hacks (diff) | |
| download | linux-23d0b8b053391afe15c9667d80de77ca88e18b8b.tar.xz linux-23d0b8b053391afe15c9667d80de77ca88e18b8b.zip | |
[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.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-x86_64/hardirq.h b/include/asm-x86_64/hardirq.h index 64a65ce2f41f..95d5e090ed89 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) |