From: David Sterba <dsterba@suse.cz>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Btrfs <linux-btrfs@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: linux-next: Tree for Dec 6 (objtool, lots in btrfs)
Date: Tue, 17 Dec 2019 16:29:54 +0100 [thread overview]
Message-ID: <20191217152954.GH3929@suse.cz> (raw)
In-Reply-To: <20191214054515.ougsr5ykhl3vvy57@treble>
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.
next prev parent reply other threads:[~2019-12-17 15:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-06 2:54 linux-next: Tree for Dec 6 Stephen Rothwell
2019-12-06 10:15 ` Geert Uytterhoeven
2019-12-06 12:43 ` Stephen Rothwell
2019-12-06 16:17 ` linux-next: Tree for Dec 6 (objtool, lots in btrfs) Randy Dunlap
2019-12-11 13:49 ` David Sterba
2019-12-11 16:21 ` Randy Dunlap
2019-12-12 18:47 ` Josh Poimboeuf
2019-12-12 20:25 ` Randy Dunlap
2019-12-13 23:03 ` Randy Dunlap
2019-12-13 23:50 ` Josh Poimboeuf
2019-12-14 0:04 ` Randy Dunlap
2019-12-14 5:45 ` Josh Poimboeuf
2019-12-14 7:05 ` Randy Dunlap
2019-12-17 15:25 ` David Sterba
2020-01-17 17:26 ` Josh Poimboeuf
2020-01-17 20:28 ` Marco Elver
2020-01-17 21:26 ` Josh Poimboeuf
2020-01-17 22:22 ` Josh Poimboeuf
2019-12-17 15:29 ` David Sterba [this message]
2020-01-10 19:46 ` David Sterba
2020-01-17 15:28 ` Josh Poimboeuf
2020-01-17 16:50 ` David Sterba
2020-01-17 17:03 ` Josh Poimboeuf
2020-01-20 15:52 ` Josh Poimboeuf
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