lkml.org 
[lkml]   [2001]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [SMP lock BUG?] Re: Feedback on preemptible kernel patch
From
Date
On Mon, 2001-09-17 at 18:40, Manfred Spraul wrote:
> > is it legal to kmap_atomic(a,b); kmap_atomic(c,d); kunmap_atomic(a,b);
>
> Yes, that's legal - just think about one kmap_atomic from process
> context, and another one in irq context.
>
> > If so, your patch may need some ounting....
> > Pavel
>
> I hope ctx_sw_off does internal counting, correct?

yes, ctx_sw_off atomically increments a counter and ctx_sw_on
atomic_dec_and_test()s it.

--
Robert M. Love
rml at ufl.edu
rml at tech9.net

-
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 13:03    [W:0.040 / U:3.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site