mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads

[karo-tx-linux.git] / mm / backing-dev.c

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3387aea112092f5ae0bcbba872f08db487bc1f2c..6b4718e2ee341d7fd7f068d83e31da014d1a5ef0 100644 (file)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -886,3 +886,23 @@ out:
        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 = 0;
+               return 0;
+       }
+
+       if (copy_to_user(buffer, kbuf, sizeof(kbuf)))
+               return -EFAULT;
+       printk_once(KERN_WARNING "%s exported in /proc is scheduled for removal\n",
+                       table->procname);
+
+       *lenp = 2;
+       *ppos += *lenp;
+       return 2;
+}