mm: move cache_line_size() to <linux/cache.h>

Not all architectures define cache_line_size() so as suggested by Andrew move
the private implementations in mm/slab.c and mm/slob.c to <linux/cache.h>.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 7 insertions, 9 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e5790fe9e330..a8ce13a54764 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -114,6 +114,9 @@ config GENERIC_TIME_VSYSCALL
 config ARCH_HAS_CPU_RELAX
         def_bool y
 
+config ARCH_HAS_CACHE_LINE_SIZE
+        def_bool y
+
 config HAVE_SETUP_PER_CPU_AREA
         def_bool X86_64 || (X86_SMP && !X86_VOYAGER)
 
diff --git a/include/linux/cache.h b/include/linux/cache.h
index 4552504c0228..97e24881c4c6 100644
--- a/include/linux/cache.h
+++ b/include/linux/cache.h
@@ -60,4 +60,8 @@
 #endif
 #endif
 
+#ifndef CONFIG_ARCH_HAS_CACHE_LINE_SIZE
+#define cache_line_size()       L1_CACHE_BYTES
+#endif
+
 #endif /* __LINUX_CACHE_H */
diff --git a/mm/slab.c b/mm/slab.c
index 7bc4a136846e..39d20f8a0791 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -139,10 +139,6 @@
 #define BYTES_PER_WORD          sizeof(void *)
 #define REDZONE_ALIGN           max(BYTES_PER_WORD, __alignof__(unsigned long long))
 
-#ifndef cache_line_size
-#define cache_line_size()       L1_CACHE_BYTES
-#endif
-
 #ifndef ARCH_KMALLOC_MINALIGN
 /*
  * Enforce a minimum alignment for the kmalloc caches.
diff --git a/mm/slub.c b/mm/slub.c
index 48fff83a1e9d..38914bc64aca 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -207,11 +207,6 @@ static inline void ClearSlabDebug(struct page *page)
 #define __KMALLOC_CACHE         0x20000000 /* objects freed using kfree */
 #define __PAGE_ALLOC_FALLBACK   0x10000000 /* Allow fallback to page alloc */
 
-/* Not all arches define cache_line_size */
-#ifndef cache_line_size
-#define cache_line_size()       L1_CACHE_BYTES
-#endif
-
 static int kmem_size = sizeof(struct kmem_cache);
 
 #ifdef CONFIG_SMP