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

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Message-ID: <CAKwvOd=nabONrWyYFK7Y06TrKBOyHHfNUiiy69VJQ2NtCpbp5Q@mail.gmail.com>
Date:   Wed, 30 Sep 2020 13:55:48 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     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 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?

>
>                                                         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