[PATCH v2] mm: migrate: remove unused includes

[Kefeng Wang <wangkefeng.wang@huawei.com>]

random.h is not needed since commit 6c542ab75714 ("mm/demotion:
build demotion targets based on explicit memory tiers"), all
functions moved into memory-tiers.

nsproxy.h is not needed since commit 228ebcbe634a ("Uninline
find_task_by_xxx set of functions"), no nsproxy, we only call
find_task_by_vpid() now.

hugetlb_cgroup.h is not needed since commit ab5ac90aecf5 ("mm,
hugetlb: do not rely on overcommit limit during migration"),
move_hugetlb_state() is called and it belongs to hugetlb.h,
which is already included.

balloon_compaction.h, we have more general movable_operations
for non-lru movable page migration, so it could be dropped.

memremap.h, userfaultfd_k.h and oom.h are introduced for zone
device page migration, but all functions are moved into
migrate_device.c, so no needed anymore too.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
v2: 
- update changelog to explain why the includes are not needed

 mm/migrate.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 35cc9d35064b..7d2bf86cc113 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -20,7 +20,6 @@
 #include <linux/pagemap.h>
 #include <linux/buffer_head.h>
 #include <linux/mm_inline.h>
-#include <linux/nsproxy.h>
 #include <linux/ksm.h>
 #include <linux/rmap.h>
 #include <linux/topology.h>
@@ -35,19 +34,13 @@
 #include <linux/syscalls.h>
 #include <linux/compat.h>
 #include <linux/hugetlb.h>
-#include <linux/hugetlb_cgroup.h>
 #include <linux/gfp.h>
 #include <linux/pfn_t.h>
-#include <linux/memremap.h>
-#include <linux/userfaultfd_k.h>
-#include <linux/balloon_compaction.h>
 #include <linux/page_idle.h>
 #include <linux/page_owner.h>
 #include <linux/sched/mm.h>
 #include <linux/ptrace.h>
-#include <linux/oom.h>
 #include <linux/memory.h>
-#include <linux/random.h>
 #include <linux/sched/sysctl.h>
 #include <linux/memory-tiers.h>
 #include <linux/pagewalk.h>
-- 
2.27.0