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-rw-r--r--include/linux/cache.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/cache.h b/include/linux/cache.h
index d742c57eaee5..5da1bbd96154 100644
--- a/include/linux/cache.h
+++ b/include/linux/cache.h
@@ -85,4 +85,17 @@
#define cache_line_size() L1_CACHE_BYTES
#endif
+/*
+ * Helper to add padding within a struct to ensure data fall into separate
+ * cachelines.
+ */
+#if defined(CONFIG_SMP)
+struct cacheline_padding {
+ char x[0];
+} ____cacheline_internodealigned_in_smp;
+#define CACHELINE_PADDING(name) struct cacheline_padding name
+#else
+#define CACHELINE_PADDING(name)
+#endif
+
#endif /* __LINUX_CACHE_H */