lkml.org 
[lkml]   [2003]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH][2.5] fix for_each_cpu compilation on UP
On Fri, 17 Jan 2003, James Bottomley wrote:

> zwane@holomorphy.com said:
> > This adds a definition for for_each_cpu when !CONFIG_SMP
> > Please apply
>
> Could you elaborate on the purpose of this a bit? for_each_cpu() is only used
> by the voyager subarch on x86 to traverse sparse CPU bitmaps efficiently in
> critical path code. It has no other use in x86 SMP because all other
> subarch's tend to compact the CPU bitmap much more.
>
> If there are other uses for the construct, it should probably be put in bitops
> and become for_each_bit(i, mask)

It's still useful in the general case for avoiding access of per cpu
memory when a cpu is offline as well as avoiding triggering events on
cpus which aren't online anymore. I'm going to hold back on this for a bit
till i actually release the code which depends on this infrastructure.

Zwane
--
function.linuxpower.ca

-
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 13:32    [W:0.050 / U:0.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site