Re: [PATCH v2 5/9] mm, page_owner: track and print last migrate reason

[Vlastimil Babka <vbabka@suse.cz>]

On 11/25/2015 09:13 AM, Joonsoo Kim wrote:
>> +	if (page_ext->last_migrate_reason != -1) {
>> +		ret += snprintf(kbuf + ret, count - ret,
>> +			"Page has been migrated, last migrate reason: %s\n",
>> +			migrate_reason_names[page_ext->last_migrate_reason]);
>> +		if (ret >= count)
>> +			goto err;
>> +	}
>> +
> 
> migrate_reason_names is defined if CONFIG_MIGRATION is enabled so
> it would cause build failure in case of !CONFIG_MIGRATION and
> CONFIG_PAGE_OWNER.
> 
> Thanks.

Ugh right, linking gives warnings... Thanks.
I think instead of adding #ifdefs here, let's move migrate_reason_names to
mm/debug.c as we gradually do with these things. Also enum
migrate_reason is defined regardless of CONFIG_MIGRATION, so match that
for migrate_reason_names as well.

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