irq: allocate irq_desc_ptrs array based on nr_irqs

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Impact: allocate irq_desc_ptrs in preparation for making it variable-sized.

This addresses this memory usage bump when NR_CPUS bumped from 128 to 4096:

    34816   +229376    264192  +658%  irq_desc_ptrs(.data.read_mostly)

The patch is split into two parts, the first simply allocates the
irq_desc_ptrs array.  Then next will deal with making it variable.
This is only when CONFIG_SPARSE_IRQS=y.

Signed-off-by: Mike Travis <travis@sgi.com>

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This commit is contained in:

Mike Travis 2009-01-10 22:24:06 -08:00 • committed by Ingo Molnar

parent e2f4d06545

commit 0fa0ebbf15

2 changed files with 16 additions and 2 deletions

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11

kernel/irq/handle.c

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7

kernel/irq/internals.h

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