nvdimm: remove nd_integrity_init

nd_integrity_init is only called from a single place.  Open code it
there, and use IS_ENABLED to remove the need for an extra stub.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240306142739.237234-2-hch@lst.de
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

Author: Christoph Hellwig

drivers/nvdimm/btt.c

@@ -6,6 +6,7 @@
 #include <linux/highmem.h>
 #include <linux/debugfs.h>
 #include <linux/blkdev.h>
+#include <linux/blk-integrity.h>
 #include <linux/pagemap.h>
 #include <linux/module.h>
 #include <linux/device.h>
@@ -1514,10 +1515,13 @@ static int btt_blk_init(struct btt *btt)
 	blk_queue_flag_set(QUEUE_FLAG_NONROT, btt->btt_disk->queue);
 	blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, btt->btt_disk->queue);
 
-	if (btt_meta_size(btt)) {
-		rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
-		if (rc)
-			goto out_cleanup_disk;
+	if (btt_meta_size(btt) && IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) {
+		struct blk_integrity bi = {
+			.tuple_size	= btt_meta_size(btt),
+			.tag_size	= btt_meta_size(btt),
+		};
+		blk_integrity_register(btt->btt_disk, &bi);
+		blk_queue_max_integrity_segments(btt->btt_disk->queue, 1);
 	}
 
 	set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);

drivers/nvdimm/core.c

@@ -7,7 +7,6 @@
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/blkdev.h>
-#include <linux/blk-integrity.h>
 #include <linux/device.h>
 #include <linux/ctype.h>
 #include <linux/ndctl.h>
@@ -508,35 +507,6 @@ int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
 }
 EXPORT_SYMBOL_GPL(nvdimm_bus_add_badrange);
 
-#ifdef CONFIG_BLK_DEV_INTEGRITY
-int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
-{
-	struct blk_integrity bi;
-
-	if (meta_size == 0)
-		return 0;
-
-	memset(&bi, 0, sizeof(bi));
-
-	bi.tuple_size = meta_size;
-	bi.tag_size = meta_size;
-
-	blk_integrity_register(disk, &bi);
-	blk_queue_max_integrity_segments(disk->queue, 1);
-
-	return 0;
-}
-EXPORT_SYMBOL(nd_integrity_init);
-
-#else /* CONFIG_BLK_DEV_INTEGRITY */
-int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
-{
-	return 0;
-}
-EXPORT_SYMBOL(nd_integrity_init);
-
-#endif
-
 static __init int libnvdimm_init(void)
 {
 	int rc;

drivers/nvdimm/nd.h

@@ -489,7 +489,6 @@ enum nd_async_mode {
 	ND_ASYNC,
 };
 
-int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 void wait_nvdimm_bus_probe_idle(struct device *dev);
 void nd_device_register(struct device *dev);
 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);