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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>

authored by

Olof Johansson and committed by
Linus Torvalds 40b64acd 4773ef22

+1 -1
+1 -1
mm/memory.c
··· 4271 4271 } 4272 4272 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ 4273 4273 4274 - #if ALLOC_SPLIT_PTLOCKS 4274 + #if USE_SPLIT_PTE_PTLOCKS && ALLOC_SPLIT_PTLOCKS 4275 4275 bool ptlock_alloc(struct page *page) 4276 4276 { 4277 4277 spinlock_t *ptl;