lkml.org 
[lkml]   [2002]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] only irq-safe atomic ops
Roman Zippel wrote:
>
> Hi,
>
> yodaiken@fsmlabs.com wrote:
>
> > Right. Without preemption it is safe to do
> > c = smp_get_cpuid();
> > ...
> > x = ++local_cache[c]
> > ..
> >
> > y = ++different_local_cache[c];
> > ..
>
> Just add:
> smp_put_cpuid();
>
> Is that so much worse?
>

ooh. me likee.

#define smp_get_cpuid() ({ preempt_disable(); smp_processor_id(); })
#define smp_put_cpuid() preempt_enable()

Does rml likee?

-
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:24    [W:0.103 / U:1.128 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site