linux-kernel - Re: [PATCH v2] srcu: avoid escaped section names

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Message-ID: <20201005184910.GC29330@paulmck-ThinkPad-P72>
Date:   Mon, 5 Oct 2020 11:49:10 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, rcu@...r.kernel.org,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH v2] srcu: avoid escaped section names

On Mon, Oct 05, 2020 at 08:38:42PM +0200, Sedat Dilek wrote:
> On Mon, Oct 5, 2020 at 8:29 PM 'Nick Desaulniers' via Clang Built
> Linux <clang-built-linux@...glegroups.com> wrote:
> >
> > On Fri, Oct 2, 2020 at 1:51 PM Paul E. McKenney <paulmck@...nel.org> wrote:
> > >
> > > On Wed, Sep 30, 2020 at 01:55:48PM -0700, Nick Desaulniers wrote:
> > > > On Wed, Sep 30, 2020 at 1:40 PM Paul E. McKenney <paulmck@...nel.org> wrote:
> > > > >
> > > > > On Tue, Sep 29, 2020 at 12:25:49PM -0700, Nick Desaulniers wrote:
> > > > > > The stringification operator, `#`, in the preprocessor escapes strings.
> > > > > > For example, `# "foo"` becomes `"\"foo\""`.  GCC and Clang differ in how
> > > > > > they treat section names that contain \".
> > > > > >
> > > > > > The portable solution is to not use a string literal with the
> > > > > > preprocessor stringification operator.
> > > > > >
> > > > > > Link: https://bugs.llvm.org/show_bug.cgi?id=42950
> > > > > > Fixes: commit fe15b50cdeee ("srcu: Allocate per-CPU data for DEFINE_SRCU() in modules")
> > > > > > Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> > > > >
> > > > > I am guessing that this needs to go up with other patches.  If so:
> > > > >
> > > > > Acked-by: Paul E. McKenney <paulmck@...nel.org>
> > > > >
> > > > > If not, let me know and I will queue it.
> > > >
> > > > I could have bundled them up as a series.  I think you can pick it up,
> > > > and I'll owe you a beer?
> > >
> > > It is queued, thank you!
> > >
> > > When does it need to hit mainline?  (Your default is the v5.11 merge
> > > window, that is, the one following the upcoming merge window.)
> >
> > No rush, this patch wasn't blocking any known issue, just a cleanup
> > while I was in the neighborhood.  100 years ago, I was an Eagle scout.
> > Pretty sure there was a motto about "leaving things better than you
> > found them."  Thanks for help resolving the merge conflict reported in
> > -next related to it.
> 
> Wasn't there a problem with your "Fixes:" tag (Fixes: *drop word
> "commit"* commit_hashid ("...")?

Indeed there was, and I have it noted to be fixed on my next rebase.

Perhaps another reason not to rush to mainline though.  ;-)

							Thanx, Paul

> - Sedat -
> 
> > >
> > >
> > >                                                         Thanx, Paul
> > >
> > > > > > ---
> > > > > > Changes V1->V2:
> > > > > > * drop unrelated Kconfig changes accidentally committed in v1.
> > > > > >
> > > > > >  include/linux/srcutree.h | 2 +-
> > > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > >
> > > > > > diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h
> > > > > > index 9cfcc8a756ae..9de652f4e1bd 100644
> > > > > > --- a/include/linux/srcutree.h
> > > > > > +++ b/include/linux/srcutree.h
> > > > > > @@ -124,7 +124,7 @@ struct srcu_struct {
> > > > > >  # define __DEFINE_SRCU(name, is_static)                                      \
> > > > > >       is_static struct srcu_struct name;                              \
> > > > > >       struct srcu_struct * const __srcu_struct_##name                 \
> > > > > > -             __section("___srcu_struct_ptrs") = &name
> > > > > > +             __section(___srcu_struct_ptrs) = &name
> > > > > >  #else
> > > > > >  # define __DEFINE_SRCU(name, is_static)                                      \
> > > > > >       static DEFINE_PER_CPU(struct srcu_data, name##_srcu_data);      \
> > > > > > --
> > > > > > 2.28.0.709.gb0816b6eb0-goog
> > > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Thanks,
> > > > ~Nick Desaulniers
> >
> >
> >
> > --
> > Thanks,
> > ~Nick Desaulniers
> >
> > --
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