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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2013-12-20 13:35:58 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-20 12:25:45 -0800
commit597d795a2a786d22dd872332428e2b9439ede639 (patch)
tree1dd7be7e737649c7d346c695e0700c9732b2d681 /include/linux/lockref.h
parentfff4068cba484e6b0abe334ed6b15d5a215a3b25 (diff)
mm: do not allocate page->ptl dynamically, if spinlock_t fits to long
In struct page we have enough space to fit long-size page->ptl there, but we use dynamically-allocated page->ptl if size(spinlock_t) is larger than sizeof(int). It hurts 64-bit architectures with CONFIG_GENERIC_LOCKBREAK, where sizeof(spinlock_t) == 8, but it easily fits into struct page. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/lockref.h')
-rw-r--r--include/linux/lockref.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index c8929c3832db..4bfde0e99ed5 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -19,7 +19,7 @@
#define USE_CMPXCHG_LOCKREF \
(IS_ENABLED(CONFIG_ARCH_USE_CMPXCHG_LOCKREF) && \
- IS_ENABLED(CONFIG_SMP) && !BLOATED_SPINLOCKS)
+ IS_ENABLED(CONFIG_SMP) && SPINLOCK_SIZE <= 4)
struct lockref {
union {