Re: [PATCH] mm, page_owner: only track migration if enabled

From: Vlastimil Babka
Date: Fri Nov 27 2015 - 09:06:23 EST


On 11/27/2015 02:58 PM, Arnd Bergmann wrote:
The newly added code to print page ownership in dump_page fails
to link when CONFIG_MIGRATION is disabled:

mm/built-in.o: In function `print_page_owner':
frame_vector.c:(.text+0x72358): undefined reference to `migrate_reason_names'

This changes the two users of migrate_reason_names to first check
CONFIG_MIGRATION, which avoids the error.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: cf7ec391dae4 ("mm, page_owner: dump page owner info from dump_page()")
---
Found on yesterday's linux-next with ARM randconfig builds. The patch
that introduced this is currently in Andrews tree.

If you don't already have a fix, please apply this one on top, or fold
it into the original commit.

Thanks. I posted a different one yesterday:
http://marc.info/?l=linux-mm&m=144853435200591&w=2


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