>> +/**
>> + * cgroup_file_mode - deduce file mode of a control file
>> + * @cft: the control file in question
>> + *
>> + * returns cftype->mode if ->mode is not 0
>> + * returns 0644 if it has both a read and a write handler
>> + * returns 0444 if it has only a read handler
>> + * returns 0200 if it has only a write hander
>> + */
>> +static int cgroup_file_mode(const struct cftype *cft)
>> +{
>> + int mode = 0;
>> +
>> + if (cft->mode)
>> + return cft->mode;
>> +
>> + if (cft->read || cft->read_u64 || cft->read_s64 ||
>> + cft->read_map || cft->read_seq_string)
>> + mode += 0444;
>> +
>> + if (cft->write || cft->write_u64 || cft->write_s64 ||
>> + cft->write_string || cft->trigger)
>> + mode += 0200;
>> +
>
> += is not |=...
>
Ah, yes, though both happen to result in 0644.
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