X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Flinux%2Fcache.h;h=1be04f8c563a0c60bdfca72a36c120ec96ef327c;hb=5f87c475f82a75e10bc6e249b7471349f1ef1636;hp=17e7e82d2aa758f9888419a9c03aa4059e16b247;hpb=379dd277edd0e19edf91710849b520629c3be4b2;p=firefly-linux-kernel-4.4.55.git

diff --git a/include/linux/cache.h b/include/linux/cache.h
index 17e7e82d2aa7..1be04f8c563a 100644
--- a/include/linux/cache.h
+++ b/include/linux/cache.h
@@ -12,10 +12,24 @@
 #define SMP_CACHE_BYTES L1_CACHE_BYTES
 #endif
 
+/*
+ * __read_mostly is used to keep rarely changing variables out of frequently
+ * updated cachelines. If an architecture doesn't support it, ignore the
+ * hint.
+ */
 #ifndef __read_mostly
 #define __read_mostly
 #endif
 
+/*
+ * __ro_after_init is used to mark things that are read-only after init (i.e.
+ * after mark_rodata_ro() has been called). These are effectively read-only,
+ * but may get written to during init, so can't live in .rodata (via "const").
+ */
+#ifndef __ro_after_init
+#define __ro_after_init __attribute__((__section__(".data..ro_after_init")))
+#endif
+
 #ifndef ____cacheline_aligned
 #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
 #endif