We already have PR for this issue :)
http://www.freebsd.org/cgi/query-pr.cgi?pr=187074
On Wed, 5 Mar 2014 03:57:00 +0400
Gleb Smirnoff <gleb...@freebsd.org> wrote:
> John-Mark,
>
> On Wed, Feb 26, 2014 at 01:20:17PM -0800, John-Mark Gurney wrote:
> J> Justin Hibbits wrote this message on Wed, Feb 26, 2014 at 11:12 -0800:
> J> > On Wed, Feb 26, 2014 at 10:32 AM, Justin Hibbits <jr...@alumni.cwru.edu>
> wrote:
> J> > > Building on PowerPC I see the following failure:
> J> > >
> J> > > cc1: warnings being treated as errors
> J> > >
> J> > > /home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:
> J> > > In function 'pfioctl':
> J> > >
> /home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:1357:warning:
> J> > > cast to pointer from integer of different size [-Wint-to-pointer-cast]
> J> > >
> /home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:1359:warning:
> J> > > cast to pointer from integer of different size [-Wint-to-pointer-cast]
> J> > >
> /home/chmeee/freebsd/head/sys/modules/pf/../../netpfil/pf/pf_ioctl.c:1361:warning:
> J> > > cast to pointer from integer of different size [-Wint-to-pointer-cast]
> J> > >
> J> > > struct pf_rule has counter_u64_t entries, which are actually pointers
> J> > > to uint64_t's. These pointers get assigned from the result of
> J> > > counter_u64_fetch(), which returns a uint64_t. Looks to me like
> J> > > there's a bug in here, but I have no idea what to do to fix it. And
> J> > > I'm surprised this hasn't been reported against other 32-bit
> J> > > architectures.
> J> >
> J> > Replying to myself, it looks like this was broken by r261882.
> J>
> J> This comment says it all:
> J> 1352 glebius 261882 /*
> J> 1353 * XXXGL: this is what happens when internal
> kernel
> J> 1354 * structures are used as ioctl API structures.
> J> 1355 */
> J>
> J> So, one way could be to use a union for the states:
> J> union {
> J> struct {
> J> counter_u64_t states_cur;
> J> counter_u64_t states_tot;
> J> counter_u64_t src_nodes;
> J> } k;
> J> struct {
> J> uint64_t states_cur;
> J> uint64_t states_tot;
> J> uint64_t src_nodes;
> J> } u;
> J> } u;
> J>
> J> The other option is to cast through uintptr_t...
> J>
> J> Even though it'd make the code a bit more ugly, I'd vote for the union,
> J> since it's designed for what the code is trying to do...
>
> Would above guarantee us that members of "k" won't cross on members
> of "u" when we fill them one by one?
>
> u.states_cur = counter_u64_fetch(k.states_cur);
> u.states_tot = counter_u64_fetch(k.states_tot);
>
> I'd prefer:
>
> union states_cur {
> counter_u64_t k;
> uint64_t u;
> }
> union states_tot {
> counter_u64_t k;
> uint64_t u;
> }
> union src_nodes {
> counter_u64_t k;
> uint64_t u;
> }
>
> Or am I overcautious?
>
> --
> Totus tuus, Glebius.
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--
Best Regards!
Michael Pounov <mi...@elwix.org>
+359 888 737358, +359 899 737358
WWW: http://www.elwix.org/
XMPP: mi...@aitnet.org
Skype: mpunov
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