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

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Message-ID: <56B45A47.4090400@bmw-carit.de>
Date:	Fri, 5 Feb 2016 09:16:07 +0100
From:	Daniel Wagner <daniel.wagner@...-carit.de>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
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

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.

With some luck I get some more architectures covered soon.

cheers,
daniel