linux-kernel - Re: h8300 build failures in linux-next (in rcu code, gcc 5.x related, not limited to h8300)

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Date:	Tue, 25 Aug 2015 08:03:35 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Mark Salter <msalter@...hat.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
CC:	uclinux-h8-devel@...ts.sourceforge.jp,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: h8300 build failures in linux-next (in rcu code, gcc 5.x related,
 not limited to h8300)

Hi Mark,

On 08/25/2015 07:27 AM, Mark Salter wrote:
> On Tue, 2015-08-25 at 14:56 +0900, Yoshinori Sato wrote:
>> On Tue, 25 Aug 2015 03:34:20 +0900,
>> Guenter Roeck wrote:
>>>
>>> Hi,
>>>
>>> In linux-next as of today (0824), all h8300 builds fail for me with an
>>> internal
>>> compiler error.
>>>
>>> Building h8300:allnoconfig ... failed
>>> --------------
>>> Error log:
>>>
>>> In file included from include/linux/rcupdate.h:429:0,
>>>                   from include/linux/rcusync.h:5,
>>>                   from kernel/rcu/sync.c:1:
>>> include/linux/rcutiny.h: In function ‘rcu_barrier_sched’:
>>> include/linux/rcutiny.h:55:20: internal compiler error: Segmentation
>>> fault
>>>   static inline void rcu_barrier_sched(void)
>>>                      ^
>>>
>>> I tried both gcc 5.1 and 5.2, built with the patch set available to me.
>>>
>>> Is there a more recent compiler / patch set available that might fix
>>> the problem ?
>>>
>>
>> No.
>> I tried gcc 6.0. It got same error.
>> It looks optimization problem on h8300 target.
>> I will investigate it.
>
> I get the same ICE with c6x gcc 5.1
>

Interesting. h8300 was the only gcc 5+ compiler I had used so far.
Just for fun, I built an alpha toolchain with gcc 5.1. Same problem there.
So it looks like it isn't a h8300 problem after all, it is a gcc problem.

Updated subject line, and copied rcu maintainers.

Guenter

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