lkml.org 
[lkml]   [2008]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] sparse_irq aka dyn_irq v13
On Thu, 13 Nov 2008 14:41:36 -0800
Yinghai Lu <yinghai@kernel.org> wrote:

> Andrew Morton wrote:
>
> >> ...
> >>
> >>>> +static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
> >>> Do these need to be 32-bit? Maybe they'll fit in 16-bit, dunno.
> >>>
> >> struct irq_desc {
> >> unsigned int irq;
> >> #ifdef CONFIG_SPARSE_IRQ
> >> struct list_head list;
> >> struct list_head hash_entry;
> >> struct timer_rand_state *timer_rand_state;
> >> unsigned int *kstat_irqs;
> >
> > That doesn't address my question.
> >
> > The above array can be very large. Can we halve its size by using
> > 16-bit quantities? Will this code ever encounter IRQ numbers larger
> > than 65536?
> >
>
> NR_CPUS=4096, NR_IRQS_LEGACY=16, and that array will be 256k bytes
>
> later could change that alloc_bootmem, so NR_CPUS will be replaced to nr_cpu_ids

Do the entries in that array need to be 32-bit?


\
 
 \ /
  Last update: 2008-11-14 00:01    [W:0.130 / U:15.612 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site