linux-kernel - Re: [PATCH tip v6 2/5] kbuild: Add option to turn incompatible pointer check into error

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Date:	Sat, 6 Feb 2016 23:39:17 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
CC:	<linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org>,
	<linux-kbuild@...r.kernel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH tip v6 2/5] kbuild: Add option to turn incompatible
 pointer check into error

[Re: [PATCH tip v6 2/5] kbuild: Add option to turn incompatible pointer check into error] On 05/02/2016 (Fri 09:16) Daniel Wagner wrote:

> On 02/01/2016 07:49 AM, Daniel Wagner wrote:
> > On 01/29/2016 07:55 PM, Paul Gortmaker wrote:
> >> [Re: [PATCH tip v6 2/5] kbuild: Add option to turn incompatible pointer check into error] On 29/01/2016 (Fri 13:17) Daniel Wagner wrote:
> >>
> >>> On 01/28/2016 03:44 PM, Daniel Wagner wrote:
> >>>> +# enforce correct pointer usage
> >>>> +KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
> >>>> +
> >>>
> >>> As it turns out there are a few fallouts by that one. I'll send fixes
> >>> for it.
> >>
> >> Did you try non-x86 builds with this applied?   I'd be really surprised
> >> if there were just a few, once you did allyesconfig/allmodconfig for
> >> ARM, MIPS, PPC, etc.
> > 
> > I have tried this with non-x86 builds and apart of a few problems all
> > looked fine. As it turns out I was using too old cross tools from
> > kernel.org [1]. Luckily Fengguang's kbuild robot did catch a bunch of
> > them (see the patches in this series).
> 
> It turns out this week was particular bad for doing anything productive.
> Anyway, I found some time to fire up some cross compilers and it looks
> promising.
> 
> I used the cross compiler version 5.2.1 shipped by Fedora 23
> and run allyesconfig/allmodconfig for ARM, ARM64, MIPS64, PPC64
> (swait-v7 and 4.5-rc2). No new errors popped up.

SOunds good ; guess my gut feeling about this causing more fallout was
off the mark.

P.
--

> 
> With some luck I get some more architectures covered soon.
> 
> cheers,
> daniel