On Fri, Dec 13, 2019 at 11:45:15PM -0600, Josh Poimboeuf wrote:
> On Fri, Dec 13, 2019 at 04:04:58PM -0800, Randy Dunlap wrote:
> > > diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> > > index b2e8fd8a8e59..bbd68520f5f1 100644
> > > --- a/fs/btrfs/ctree.h
> > > +++ b/fs/btrfs/ctree.h
> > > @@ -3110,14 +3110,16 @@ do { \
> > > rcu_read_unlock(); \
> > > } while (0)
> > >
> > > -__cold
> > > +#ifdef CONFIG_BTRFS_ASSERT
> > > +__cold __unlikely
> >
> > what provides __unlikely? It is causing build errors.
> >
> > and if I remove the "__unlikely", I still see the objtool warnings
> > (unreachable instructions).
>
> Ha, not sure how that happened... Should be __noreturn instead of
> __unlikely. Cheers...
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index b2e8fd8a8e59..398bd010dfc5 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -3110,14 +3110,16 @@ do { \
> rcu_read_unlock(); \
> } while (0)
>
> -__cold
> +#ifdef CONFIG_BTRFS_ASSERT
> +__cold __noreturn
> static inline void assfail(const char *expr, const char *file, int line)
> {
> - if (IS_ENABLED(CONFIG_BTRFS_ASSERT)) {
> - pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
> - BUG();
> - }
> + pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
> + BUG();
> }
> +#else
> +static inline void assfail(const char *expr, const char *file, int line) {}
> +#endif
>
> #define ASSERT(expr) \
> (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
Separating the definitions by #ifdef looks ok, I'd rather do separate
definitions of ASSERT too, to avoid the ternary operator. I'll send the
patch.
