linux-kernel - Re: [PATCH] branch tracer: fix freak link error

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Date:	Fri, 12 Feb 2016 23:18:56 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: Re: [PATCH] branch tracer: fix freak link error

On Friday 12 February 2016 17:12:37 Steven Rostedt wrote:
> On Fri, 12 Feb 2016 22:52:10 +0100
> Arnd Bergmann <arnd@...db.de> wrote:
> 
> > On Friday 12 February 2016 22:49:07 Arnd Bergmann wrote:
> > > Now I have to check if it does anything to the spurious "maybe-uninitialized"
> > > warnings that I saw creeping in with PROFILE_ALL_BRANCHES. My guess is
> > > that it doesn't fix them (I submitted a patch to turn off those
> > > warnings today when PROFILE_ALL_BRANCHES is set), but I'll try anyway.   
> > 
> > Ok, that was easy: they are all still there, so we still need to
> > pass -Wno-maybe-uninitialized when using PROFILE_ALL_BRANCHES to
> > avoid flooding the log with useless warnings.
> 
> Yeah, those warnings were the reason I turned PROFILE_ALL_BRANCHES into
> a tristate and not a boolean, otherwise a make allmodconfig or
> allyesconfig would enable it and spam the compile with those warnings.
> 
> I simply ignore them, so adding a way to turn them off when that is
> enabled is probably a good idea.

Ok. The series I sent today was titled "[PATCH 0/5] gcov fixes and
maybe-uninitialized warnings", and I disable the warnings for
both GCOV_PROFILE_ALL and PROFILE_ALL_BRANCHES there, along with
CC_OPTIMIZE_FOR_SIZE and UBSAN_SANITIZE_ALL that already do that
today.

The patch series also makes sure that all four options are disabled
in allmodconfig (today they are disabled because of CC_OPTIMIZE_FOR_SIZE)
and the remaining warnings I get in both allmodconfig and randconfig
are finally useful.

	Arnd