linux-kernel - Re: [BUG] -next objtool build failure (bisected)

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Message-ID: <3d0ae79c-ed26-414e-8594-c83c91040551@paulmck-laptop>
Date: Tue, 15 Oct 2024 11:46:30 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: bentiss@...nel.org, sfr@...b.auug.org.au, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org, linux-toolchains@...r.kernel.org,
	jpoimboe@...nel.org
Subject: Re: [BUG] -next objtool build failure (bisected)

On Tue, Oct 15, 2024 at 11:33:11AM -0700, Dmitry Torokhov wrote:
> Hi Paul,
> 
> On Tue, Oct 15, 2024 at 11:10:11AM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > The next-20241011 release gets me build errors like the following:
> > 
> > 	vmlinux.o: warning: objtool: fetch_item() falls through to next function
> > 
> > Bisection leads me here:
> > 
> > 	61595012f280 ("HID: simplify code in fetch_item()")
> > 
> > This diff looks inoffensive to me, but I get this error on this commit
> > and not on its predecessor.
> > 
> > This build failure happens on quite a few different kernel configurations.
> > I bisected using this particular reproducer:
> > 
> > tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --buildonly --configs SRCU-T
> > 
> > Thoughts?
> 
> I just added you to another thread where Nathan proposed a couple of
> solutions:
> 
> https://lore.kernel.org/r/20241010222451.GA3571761@thelio-3990X

Thank you, Dmitry!  Glad that it is not just me?  ;-)

							Thanx, Paul