linux-kernel - Re: [tip:smp/hotplug 4/8] kernel/cpu.c:1252:3: error: unknown field 'startup' specified in initializer

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Message-ID: <alpine.DEB.2.20.1609021409170.5647@nanos>
Date:   Fri, 2 Sep 2016 14:10:08 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
cc:     kbuild test robot <fengguang.wu@...el.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: Re: [tip:smp/hotplug 4/8] kernel/cpu.c:1252:3: error: unknown field
 'startup' specified in initializer

On Fri, 2 Sep 2016, Sebastian Andrzej Siewior wrote:
> On 2016-09-02 17:42:33 [+0800], kbuild test robot wrote:
> > compiler: or32-linux-gcc (GCC) 4.5.1-or32-1.0rc1
> > 
> > >> kernel/cpu.c:1252:3: error: unknown field 'startup' specified in initializer
> > >> kernel/cpu.c:1252:3: warning: missing braces around initializer
> >    kernel/cpu.c:1252:3: warning: (near initialization for 'cpuhp_bp_states[0].<anonymous>')
> > >> kernel/cpu.c:1253:3: error: unknown field 'teardown' specified in initializer
> >    kernel/cpu.c:1425:3: error: unknown field 'startup' specified in initializer
> >    kernel/cpu.c:1425:3: warning: missing braces around initializer
> >    kernel/cpu.c:1425:3: warning: (near initialization for 'cpuhp_ap_states[121].<anonymous>')
> >    kernel/cpu.c:1426:3: error: unknown field 'teardown' specified in initializer
> 
> This is a compiler issue. We have:
> | struct cpuhp_step {
> |         const char              *name;
> |         union {
> |                 int             (*startup)(unsigned int cpu);
> |                 int             (*startup_multi)(unsigned int cpu,
> |                                                  void *node);
> |         };
> …
> | };
> This unnamed union fields are valid as of ISO C11.
> It seems that gcc 4.5 and earlier can't access ->startup. According to
> [0] this is supported since gcc 4.6.
> 
> [0] https://gcc.gnu.org/wiki/C11Status

And we have anon unions in other places as well. See
include/linux/spinlock_types.h

Thanks

	tglx