linux-kernel - Re: linux-next: Tree for Dec 6 (objtool, lots in btrfs)

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Date:   Thu, 12 Dec 2019 12:47:25 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     dsterba@...e.cz, Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Btrfs <linux-btrfs@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: linux-next: Tree for Dec 6 (objtool, lots in btrfs)

On Wed, Dec 11, 2019 at 08:21:38AM -0800, Randy Dunlap wrote:
> [oops, forgot to add Josh and PeterZ]
> 
> On 12/11/19 5:49 AM, David Sterba wrote:
> > On Fri, Dec 06, 2019 at 08:17:30AM -0800, Randy Dunlap wrote:
> >> On 12/5/19 6:54 PM, Stephen Rothwell wrote:
> >>> Hi all,
> >>>
> >>> Please do not add any material for v5.6 to your linux-next included
> >>> trees until after v5.5-rc1 has been released.
> >>>
> >>> Changes since 20191204:
> >>>
> >>
> >> on x86_64:
> >>
> >> fs/btrfs/ctree.o: warning: objtool: btrfs_search_slot()+0x2d4: unreachable instruction
> > 
> > Can somebody enlighten me what is one supposed to do to address the
> > warnings? Function names reported in the list contain our ASSERT macro
> > that conditionally calls BUG() that I believe is what could cause the
> > unreachable instructions but I don't see how.
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/btrfs/ctree.h#n3113
> > 
> > __cold
> > 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();
> > 	}
> > }
> > 
> > #define ASSERT(expr)	\
> > 	(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
> > 

Randy, can you share one of the btrfs .o files?  I'm not able to
recreate.

-- 
Josh