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
