lkml.org 
[lkml]   [2002]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [2.4.17/18pre] VM and swap - it's really unusable
On Sat, Jan 12, 2002 at 10:10:55PM -0500, Robert Love wrote:
> It can if we increment the preempt_count in disable_irq_nosync and
> decrement it on enable_irq.

Who says you're going to be enabling IRQs any time soon? AFAIK, there is
nothing that requires enable_irq to be called after disable_irq_nosync.

In fact, you could well have the following in a driver:

/* initial shutdown of device */

disable_irq_nosync(i); /* or disable_irq(i); */

/* other shutdown stuff */

free_irq(i, private);

and you would have to audit all drivers to find out if they did this -
this would seriously damage your preempt_count.

--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html

-
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 13:15    [W:0.177 / U:0.256 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site