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

    Sebastian

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