linux-kernel - [PATCH 2/2] mm: fix undefined reference to `.kernel_map

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Message-ID: <20150120140200.aa7ba0eb28d95e456972e178@freescale.com>
Date:	Tue, 20 Jan 2015 14:02:00 -0600
From:	Kim Phillips <kim.phillips@...escale.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Rik van Riel <riel@...hat.com>,
	Josh Triplett <josh@...htriplett.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
	Jens Axboe <axboe@...com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>
Subject: [PATCH 2/2] mm: fix undefined reference to `.kernel_map_pages' on
 PPC builds

It's possible to configure DEBUG_PAGEALLOC without PAGE_POISONING on
ppc.  Fix building the generic kernel_map_pages() implementation in
this case:

  LD      init/built-in.o
mm/built-in.o: In function `free_pages_prepare':
mm/page_alloc.c:770: undefined reference to `.kernel_map_pages'
mm/built-in.o: In function `prep_new_page':
mm/page_alloc.c:933: undefined reference to `.kernel_map_pages'
mm/built-in.o: In function `map_pages':
mm/compaction.c:61: undefined reference to `.kernel_map_pages'
make: *** [vmlinux] Error 1

Signed-off-by: Kim Phillips <kim.phillips@...escale.com>
---
 mm/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Makefile b/mm/Makefile
index 4bf586e..2956467 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_SLOB) += slob.o
 obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
 obj-$(CONFIG_KSM) += ksm.o
 obj-$(CONFIG_PAGE_POISONING) += debug-pagealloc.o
+obj-$(CONFIG_DEBUG_PAGEALLOC) += debug-pagealloc.o
 obj-$(CONFIG_SLAB) += slab.o
 obj-$(CONFIG_SLUB) += slub.o
 obj-$(CONFIG_KMEMCHECK) += kmemcheck.o
-- 
2.2.2

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