lkml.org 
[lkml]   [2008]   [Aug]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH -V3 01/11] percpu_counters: make fbc->count read atomic on 32 bit architecture
From
Date
On Wed, 2008-08-27 at 14:22 -0700, Andrew Morton wrote:

> btw, what the heck is percpu_counter_init_irq()? Some mysterious
> lockdep-specific thing?
>
> <does git-fiddle. Oh. crappy changelog.>
>
> I let that one leak through uncommented. Must be getting old.
> Probably it will need an EXPORT_SYMBOL() sometime.

Basically all it does it break the percpu_counter lock into two classes.

One for the irq-unsafe users and one for the irq-safe users. Without
this lockdep goes splat complaining about irq recursion deadlocks and
the like between these two separate users.



\
 
 \ /
  Last update: 2008-08-28 10:03    [from the cache]
©2003-2011 Jasper Spaans