shmem_quota: build the object file conditionally to the config option

Initially I added shmem-quota to obj-y, move it to the correct place and
remove the unneeded full file #ifdef

Link: https://lkml.kernel.org/r/20240717063737.910840-1-cem@kernel.orgSigned-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Suggested-by: Aristeu Rozanski <aris@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/Makefile

@@ -53,7 +53,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
 			   readahead.o swap.o truncate.o vmscan.o shrinker.o \
 			   shmem.o util.o mmzone.o vmstat.o backing-dev.o \
 			   mm_init.o percpu.o slab_common.o \
-			   compaction.o show_mem.o shmem_quota.o\
+			   compaction.o show_mem.o \
 			   interval_tree.o list_lru.o workingset.o \
 			   debug.o gup.o mmap_lock.o $(mmu-y)
 
@@ -141,3 +141,4 @@ obj-$(CONFIG_HAVE_BOOTMEM_INFO_NODE) += bootmem_info.o
 obj-$(CONFIG_GENERIC_IOREMAP) += ioremap.o
 obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o
 obj-$(CONFIG_EXECMEM) += execmem.o
+obj-$(CONFIG_TMPFS_QUOTA) += shmem_quota.o

mm/shmem_quota.c

@@ -34,8 +34,6 @@
 #include <linux/quotaops.h>
 #include <linux/quota.h>
 
-#ifdef CONFIG_TMPFS_QUOTA
-
 /*
  * The following constants define the amount of time given a user
  * before the soft limits are treated as hard limits (usually resulting
@@ -351,4 +349,3 @@ const struct dquot_operations shmem_quota_operations = {
 	.mark_dirty		= shmem_mark_dquot_dirty,
 	.get_next_id		= shmem_get_next_id,
 };
-#endif /* CONFIG_TMPFS_QUOTA */