HWPOISON: remove the free buddy page handler

The buddy page has already be handled in the very beginning.
So remove redundant code.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

1 files changed, 4 insertions, 10 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 9a285f8cdbe1..676ab394200e 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -401,14 +401,6 @@ static int me_unknown(struct page *p, unsigned long pfn)
 }
 
 /*
- * Free memory
- */
-static int me_free(struct page *p, unsigned long pfn)
-{
-        return DELAYED;
-}
-
-/*
  * Clean (or cleaned) page cache page.
  */
 static int me_pagecache_clean(struct page *p, unsigned long pfn)
@@ -604,7 +596,6 @@ static int me_huge_page(struct page *p, unsigned long pfn)
 #define tail            (1UL << PG_tail)
 #define compound        (1UL << PG_compound)
 #define slab            (1UL << PG_slab)
-#define buddy           (1UL << PG_buddy)
 #define reserved        (1UL << PG_reserved)
 
 static struct page_state {
@@ -614,7 +605,10 @@ static struct page_state {
         int (*action)(struct page *p, unsigned long pfn);
 } error_states[] = {
         { reserved,     reserved,       "reserved kernel",      me_ignore },
-        { buddy,        buddy,          "free kernel",  me_free },
+        /*
+         * free pages are specially detected outside this table:
+         * PG_buddy pages only make a small fraction of all free pages.
+         */
 
         /*
          * Could in theory check if slab page is free or if we can drop