Messages in this thread Patch in this message | | | Date | Sat, 10 Jan 2009 14:38:21 -0800 | From | Mike Travis <> | Subject | [PATCH 3/4] irq: initialize nr_irqs based on nr_cpu_ids |
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Impact: Reduce memory usage.
This is the second half of the changes to make the irq_desc_ptrs be variable sized based on nr_cpu_ids. The algorithm is the same as the setting of NR_IRQS except use nr_cpu_ids instead of NR_CPUS. This is only when CONFIG_SPARSE_IRQS=y.
Signed-off-by: Mike Travis <travis@sgi.com> --- kernel/irq/handle.c | 5 +++++ 1 file changed, 5 insertions(+)
Files linux-2.6-for-ingo.orig/kernel/irq/.handle.c.swp and linux-2.6-for-ingo/kernel/irq/.handle.c.swp differ --- linux-2.6-for-ingo.orig/kernel/irq/handle.c +++ linux-2.6-for-ingo/kernel/irq/handle.c @@ -133,6 +133,11 @@ int __init early_irq_init(void) int legacy_count; int i; + /* initialize nr_irqs based on nr_cpu_ids */ + nr_irqs = (8 * nr_cpu_ids) > (32 * MAX_IO_APICS) ? + NR_VECTORS + (8 * nr_cpu_ids) : + NR_VECTORS + (32 * MAX_IO_APICS); + printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs); desc = irq_desc_legacy; --
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