From: Michal Nazarewicz <redacted>

This commit exports some of the functions from compaction.c file
outside of it adding their declaration into internal.h header
file so that other mm related code can use them.

This forced compaction.c to always be compiled (as opposed to being
compiled only if CONFIG_COMPACTION is defined) but as to avoid
introducing code that user did not ask for, part of the compaction.c
is now wrapped in on #ifdef.

Signed-off-by: Michal Nazarewicz <redacted>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 mm/Makefile     |    3 +-
 mm/compaction.c |  314 ++++++++++++++++++++++++++-----------------------------
 mm/internal.h   |   33 ++++++
 3 files changed, 184 insertions(+), 166 deletions(-)

diff --git a/mm/Makefile b/mm/Makefile
index 50ec00e..8aada89 100644
--- a/mm/Makefile
+++ b/mm/Makefile

@@ -13,7 +13,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
 			   readahead.o swap.o truncate.o vmscan.o shmem.o \
 			   prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
 			   page_isolation.o mm_init.o mmu_context.o percpu.o \
-			   $(mmu-y)
+			   compaction.o $(mmu-y)
 obj-y += init-mm.o
 
 ifdef CONFIG_NO_BOOTMEM

@@ -32,7 +32,6 @@ obj-$(CONFIG_NUMA) 	+= mempolicy.o
 obj-$(CONFIG_SPARSEMEM)	+= sparse.o
 obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
 obj-$(CONFIG_SLOB) += slob.o
-obj-$(CONFIG_COMPACTION) += compaction.o
 obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
 obj-$(CONFIG_KSM) += ksm.o
 obj-$(CONFIG_PAGE_POISONING) += debug-pagealloc.o

diff --git a/mm/compaction.c b/mm/compaction.c
index 63f82be..3e21d28 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c

@@ -16,30 +16,11 @@
 #include <linux/sysfs.h>
 #include "internal.h"
 
+#if defined CONFIG_COMPACTION || defined CONFIG_CMA
+