Mailing List Archive

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1227191039 0
# Node ID e7da388ff95de8e17ad2d92989d5c375411bc5ad
# Parent 935bd48f096ad79954a5ceef60b2dc19ebb9bc3a
x86: make NR_IRQS build-time configurable

While keeping the NR_IRQS default at 256 here, I think it would be a
good thing to set it to a higher value to make sure no new mixing of
irq and vector spaces slip in.

Tested with NR_IRQS forced to 1024.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
---
xen/Rules.mk | 3 +++
xen/include/asm-x86/config.h | 6 ++++++
xen/include/asm-x86/domain.h | 2 +-
xen/include/asm-x86/mach-default/irq_vectors.h | 3 ---
4 files changed, 10 insertions(+), 4 deletions(-)

diff -r 935bd48f096a -r e7da388ff95d xen/Rules.mk
--- a/xen/Rules.mk Thu Nov 20 14:23:33 2008 +0000
+++ b/xen/Rules.mk Thu Nov 20 14:23:59 2008 +0000
@@ -69,6 +69,9 @@ ifneq ($(max_phys_cpus),)
ifneq ($(max_phys_cpus),)
CFLAGS-y += -DMAX_PHYS_CPUS=$(max_phys_cpus)
endif
+ifneq ($(max_phys_irqs),)
+CFLAGS-y += -DMAX_PHYS_IRQS=$(max_phys_irqs)
+endif

AFLAGS-y += -D__ASSEMBLY__

diff -r 935bd48f096a -r e7da388ff95d xen/include/asm-x86/config.h
--- a/xen/include/asm-x86/config.h Thu Nov 20 14:23:33 2008 +0000
+++ b/xen/include/asm-x86/config.h Thu Nov 20 14:23:59 2008 +0000
@@ -49,6 +49,12 @@
#define NR_CPUS MAX_PHYS_CPUS
#else
#define NR_CPUS 32
+#endif
+
+#ifdef MAX_PHYS_IRQS
+#define NR_IRQS MAX_PHYS_IRQS
+#else
+#define NR_IRQS 256
#endif

#if defined(__i386__) && (NR_CPUS > 32)
diff -r 935bd48f096a -r e7da388ff95d xen/include/asm-x86/domain.h
--- a/xen/include/asm-x86/domain.h Thu Nov 20 14:23:33 2008 +0000
+++ b/xen/include/asm-x86/domain.h Thu Nov 20 14:23:59 2008 +0000
@@ -236,7 +236,7 @@ struct arch_domain

/* NB. protected by d->event_lock and by irq_desc[vector].lock */
int vector_pirq[NR_VECTORS];
- int pirq_vector[NR_IRQS];
+ s16 pirq_vector[NR_IRQS];

/* Pseudophysical e820 map (XENMEM_memory_map). */
struct e820entry e820[3];
diff -r 935bd48f096a -r e7da388ff95d xen/include/asm-x86/mach-default/irq_vectors.h
--- a/xen/include/asm-x86/mach-default/irq_vectors.h Thu Nov 20 14:23:33 2008 +0000
+++ b/xen/include/asm-x86/mach-default/irq_vectors.h Thu Nov 20 14:23:59 2008 +0000
@@ -30,7 +30,4 @@

#define NR_VECTORS 256

-/* Limited by number of trap vectors. */
-#define NR_IRQS NR_VECTORS
-
#endif /* _ASM_IRQ_VECTORS_H */

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