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SubjectRE: [PATCH]2.6.3-rc2 MSI Support for IA64
Friday, Feb. 20, 2004 10:58 AM, Mika Penttilä wrote:

>ia64 already has a function ia64_alloc_vector(void) in
>arch/ia64/kernel/irq_ia64, why the doubling?

ia64_alloc_vector (void)
@@ -67,6 +68,7 @@
panic("ia64_alloc_vector: out of interrupt vectors!");
return next_vector++;

#ifndef CONFIG_PCI_USE_VECTOR is added in arch/ia64/kernel/irq_ia64.c
as above to avoid the double definement of ia64_alloc_vector(void).
Setting CONFIG_PCI_USE_VECTOR to 'Y' by enabling MSI support will
use function ia64_alloc_vector(void) defined in drivers/pci/msi.c.
The main reason behind it is to keep track of the number of vectors
already assigned during the runtime. Keeping track of already assigned
vectors is required in MSI implementation.


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