mm: remove shmem_mapping() shmem_zero_setup() duplicates

Remove the prototypes for shmem_mapping() and shmem_zero_setup() from
linux/mm.h, since they are already provided in linux/shmem_fs.h.  But
shmem_fs.h must then provide the inline stub for shmem_mapping() when
CONFIG_SHMEM is not set, and a few more cfiles now need to #include it.

Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1702081658250.1549@eggly.anvils
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/microblaze/pci/pci-common.c

@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/mm.h>
+#include <linux/shmem_fs.h>
 #include <linux/list.h>
 #include <linux/syscalls.h>
 #include <linux/irq.h>

arch/powerpc/kernel/pci-common.c

@@ -25,6 +25,7 @@
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
 #include <linux/mm.h>
+#include <linux/shmem_fs.h>
 #include <linux/list.h>
 #include <linux/syscalls.h>
 #include <linux/irq.h>

include/linux/mm.h

@@ -1168,16 +1168,6 @@ extern void pagefault_out_of_memory(void);
 
 extern void show_free_areas(unsigned int flags, nodemask_t *nodemask);
 
-int shmem_zero_setup(struct vm_area_struct *);
-#ifdef CONFIG_SHMEM
-bool shmem_mapping(struct address_space *mapping);
-#else
-static inline bool shmem_mapping(struct address_space *mapping)
-{
-	return false;
-}
-#endif
-
 extern bool can_do_mlock(void);
 extern int user_shm_lock(size_t, struct user_struct *);
 extern void user_shm_unlock(size_t, struct user_struct *);

include/linux/shmem_fs.h

@@ -57,7 +57,14 @@ extern int shmem_zero_setup(struct vm_area_struct *);
 extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr,
 		unsigned long len, unsigned long pgoff, unsigned long flags);
 extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
+#ifdef CONFIG_SHMEM
 extern bool shmem_mapping(struct address_space *mapping);
+#else
+static inline bool shmem_mapping(struct address_space *mapping)
+{
+	return false;
+}
+#endif /* CONFIG_SHMEM */
 extern void shmem_unlock_mapping(struct address_space *mapping);
 extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
 					pgoff_t index, gfp_t gfp_mask);

mm/madvise.c

@@ -21,6 +21,7 @@
 #include <linux/backing-dev.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
+#include <linux/shmem_fs.h>
 #include <linux/mmu_notifier.h>
 
 #include <asm/tlb.h>

mm/memcontrol.c

@@ -35,6 +35,7 @@
 #include <linux/memcontrol.h>
 #include <linux/cgroup.h>
 #include <linux/mm.h>
+#include <linux/shmem_fs.h>
 #include <linux/hugetlb.h>
 #include <linux/pagemap.h>
 #include <linux/smp.h>

mm/mincore.c

@@ -14,6 +14,7 @@
 #include <linux/syscalls.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
+#include <linux/shmem_fs.h>
 #include <linux/hugetlb.h>
 
 #include <linux/uaccess.h>

mm/truncate.c

@@ -20,6 +20,7 @@
 #include <linux/task_io_accounting_ops.h>
 #include <linux/buffer_head.h>	/* grr. try_to_release_page,
 				   do_invalidatepage */
+#include <linux/shmem_fs.h>
 #include <linux/cleancache.h>
 #include <linux/rmap.h>
 #include "internal.h"

mm/workingset.c

@@ -6,6 +6,7 @@
 
 #include <linux/memcontrol.h>
 #include <linux/writeback.h>
+#include <linux/shmem_fs.h>
 #include <linux/pagemap.h>
 #include <linux/atomic.h>
 #include <linux/module.h>