diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 157e950a70dc108eb7f49a00f4bf071b19637cff..872afa41abc2d78b4d01b279ae0d92bf887adfaa 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -172,8 +172,6 @@ static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)
 
 long congestion_wait(int sync, long timeout);
 long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout);
-int pdflush_proc_obsolete(struct ctl_table *table, int write,
-		void __user *buffer, size_t *lenp, loff_t *ppos);
 
 static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi)
 {
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index e19606bb41a0b5b48f6cbca8268eb529718da45c..74b52dfd5852da3e211ae949ce7d31133361c14b 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -1072,23 +1072,3 @@ long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout)
 	return ret;
 }
 EXPORT_SYMBOL(wait_iff_congested);
-
-int pdflush_proc_obsolete(struct ctl_table *table, int write,
-			void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-	char kbuf[] = "0\n";
-
-	if (*ppos || *lenp < sizeof(kbuf)) {
-		*lenp = 0;
-		return 0;
-	}
-
-	if (copy_to_user(buffer, kbuf, sizeof(kbuf)))
-		return -EFAULT;
-	pr_warn_once("%s exported in /proc is scheduled for removal\n",
-		     table->procname);
-
-	*lenp = 2;
-	*ppos += *lenp;
-	return 2;
-}