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

Since per-BDI flusher threads were introduced in 2.6, the pdflush
mechanism is not used any more.  But the old interface exported through
/proc/sys/vm/nr_pdflush_threads still exists and is obviously useless.

For back-compatibility, printk warning information and return 2 to notify
the users that the interface is removed.

Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3387aea11209..6b4718e2ee34 100644
--- 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;
+}