Re: [opensuse-kernel] Re: [PATCH] include/log2.h: Fix rounddown_pow_of_two(1)

[Andrew Morton <akpm@linux-foundation.org>]

On Thu, 17 Nov 2011 20:19:06 -0300
Cristian Rodr__guez <crrodriguez@opensuse.org> wrote:

> On 17/11/11 20:05, Andrew Morton wrote:
> 
> > I assume that nobody has gone off and checked whether all current
> > callers will survive this change.  If they had, they'd have looked in
> > drivers/char/ramoops.c and seen:
> > 
> > 	rounddown_pow_of_two(pdata->mem_size);
> > 	rounddown_pow_of_two(pdata->record_size);
> > 
> > These operations are no-ops.  It should be
> > 
> > 	pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
> > 	pdata->record_size = rounddown_pow_of_two(pdata->record_size);
> > 
> > That we have this many warts using these interfaces is an indication
> > that the interfaces aren't very good.  Poorly documented, at least.
> > 
> 
> making that macro an inline function and annotating with
> __attribute__((warn_unused_result)) looks like a good start for me.

The problem is:

 * - this can be used to initialise global variables from constant data

I'm surprised that this is true.  Is gcc smart enough to actually do
this?

<tests it>

--- a/fs/open.c~a
+++ a/fs/open.c
@@ -31,6 +31,10 @@
 #include <linux/ima.h>
 #include <linux/dnotify.h>
 
+#include <linux/log2.h>
+
+int blap = rounddown_pow_of_two(42);
+
 #include "internal.h"
 
 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
_

ooh, it worked.