mm/pageblock: remove get/set_pageblock_flags

get_pageblock_flags and set_pageblock_flags are not used any more, this
patch removes them.

Signed-off-by: Wanpeng Li <[e-mail]>
Reviewed-by: Michal Hocko <[e-mail]>
Cc: KAMEZAWA Hiroyuki <[e-mail]>
Cc: David Rientjes <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/pageblock-flags.h

···
 							PB_migrate_skip)
 #endif /* CONFIG_COMPACTION */
 
-#define get_pageblock_flags(page) \
-			get_pageblock_flags_group(page, 0, PB_migrate_end)
-#define set_pageblock_flags(page, flags) \
-			set_pageblock_flags_group(page, flags,	\
-						  0, PB_migrate_end)
-
 #endif	/* PAGEBLOCK_FLAGS_H */