From: Olof Johansson <olof@lixom.net>
Date: Fri, 20 Dec 2013 22:28:05 +0000 (-0800)
Subject: mm: fix build of split ptlock code
X-Git-Tag: upstream/snapshot3+hdmi~3739
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=40b64acd17a2200579db265048b4a51998a84729;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

mm: fix build of split ptlock code

Commit 597d795a2a78 ('mm: do not allocate page->ptl dynamically, if
spinlock_t fits to long') restructures some allocators that are compiled
even if USE_SPLIT_PTLOCKS arn't used.  It results in compilation
failure:

  mm/memory.c:4282:6: error: 'struct page' has no member named 'ptl'
  mm/memory.c:4288:12: error: 'struct page' has no member named 'ptl'

Add in the missing ifdef.

Fixes: 597d795a2a78 ('mm: do not allocate page->ptl dynamically, if spinlock_t fits to long')
Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memory.c b/mm/memory.c
index b6e211b..6768ce9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4271,7 +4271,7 @@ void copy_user_huge_page(struct page *dst, struct page *src,
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
 
-#if ALLOC_SPLIT_PTLOCKS
+#if USE_SPLIT_PTE_PTLOCKS && ALLOC_SPLIT_PTLOCKS
 bool ptlock_alloc(struct page *page)
 {
 	spinlock_t *ptl;