lkml.org 
[lkml]   [2006]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] Allow NULL pointers in percpu_free
From
Date
On Fri, 2006-11-17 at 13:07 -0500, Alan Stern wrote:
> On Fri, 17 Nov 2006, Daniel Walker wrote:
>
> > On Fri, 2006-11-17 at 12:36 -0500, Alan Stern wrote:
> >
> > > void percpu_free(void *__pdata)
> > > {
> > > + if (!__pdata)
> > > + return;
> >
> > Should be unlikely() right?
>
> It certainly could be. I tend not to put such annotations in my code, but
> it wouldn't hurt.

It's actually a really good idea to add them .. I've noticed they tend
to make my kernels smaller, although I wouldn't expect that to always be
the case.. Another reason is that in -mm we can track how often this
condition is triggered with likely profiling. With kfree, for instance,
there were a number of callers that frequently called kfree(NULL), which
IMO isn't good.

Daniel

-
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: 2006-11-17 19:17    [from the cache]
©2003-2011 Jasper Spaans