lkml.org 
[lkml]   [2009]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus
On Tue, 22 Sep 2009, Tejun Heo wrote:

>
> +#ifdef CONFIG_SMP
> + . = ALIGN(PERCPU_PAGE_SIZE);
> + __cpu0_per_cpu = .;

__per_cpu_start?

> + . = . + PERCPU_PAGE_SIZE; /* cpu0 per-cpu space */
> +#endif

This is a statically sized per cpu area that is used by __get_cpu_var()
Data is access via a cpu specific memory mapping. How does this work when
the area grows beyond PERCPU_PAGE_SIZE? As far as I can see: It seems
that __get_cpu_var would then cause a memory fault?


\
 
 \ /
  Last update: 2009-09-23 01:21    [W:0.208 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site