linux-kernel - Re: fs/dlm/midcomms.c:913:22: sparse: sparse: restricted _

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Date:   Mon, 24 Jan 2022 12:36:06 -0500
From:   Alexander Aring <aahringo@...hat.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, David Teigland <teigland@...hat.com>,
        cluster-devel <cluster-devel@...hat.com>,
        linux-sparse@...r.kernel.org, rcu@...r.kernel.org
Subject: Re: fs/dlm/midcomms.c:913:22: sparse: sparse: restricted __le32
 degrades to integer

Hi,

On Mon, Jan 24, 2022 at 12:21 PM Alexander Aring <aahringo@...hat.com> wrote:
>
> Hi,
>
> On Mon, Jan 24, 2022 at 7:46 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
> >
> > On Sun, Jan 23, 2022 at 01:41:52PM -0500, Alexander Aring wrote:
> > >
> > > I see also:
> > >
> > > fs/dlm/midcomms.c:213:1: sparse: sparse: symbol
> > > '__srcu_struct_nodes_srcu' was not declared. Should it be static?
> > >
> >
> > Why not just do this?  (Untested.  Maybe I don't understand?)
> >
> > diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h
> > index cb1f4351e8ba..a164089abec4 100644
> > --- a/include/linux/srcutree.h
> > +++ b/include/linux/srcutree.h
> > @@ -121,7 +121,7 @@ struct srcu_struct {
> >  #ifdef MODULE
> >  # define __DEFINE_SRCU(name, is_static)                                        \
> >         is_static struct srcu_struct name;                              \
> > -       struct srcu_struct * const __srcu_struct_##name                 \
> > +       is_static struct srcu_struct * const __srcu_struct_##name       \
> >                 __section("___srcu_struct_ptrs") = &name
> >  #else
> >  # define __DEFINE_SRCU(name, is_static)                                        \
> >
>
> I tried it and yes it will fix the issue and introduce another one
> about "is_static struct srcu_struct * const __srcu_struct_##name" is
> unused ("-Wunused-const-variable").
> I added a __maybe_unused after the introduced is_static and it seems
> to fix the introduced issue, now it compiles and sparse is happy. I am
> not sure if this is the right fix?

it is obviously unused, but it has something to do with
"__section("___srcu_struct_ptrs")" and during module loading it, I
suppose, srcu tries to access it to find whatever needs to be
registered?

- Alex