1 files changed, 33 insertions, 35 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
index 3a19c79918e0..4560d8f1545d 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -302,6 +302,28 @@ struct mod_tree_node {
 	struct latch_tree_node node;
 };
 
+struct module_layout {
+	/* The actual code + data. */
+	void *base;
+	/* Total size. */
+	unsigned int size;
+	/* The size of the executable code.  */
+	unsigned int text_size;
+	/* Size of RO section of the module (text+rodata) */
+	unsigned int ro_size;
+
+#ifdef CONFIG_MODULES_TREE_LOOKUP
+	struct mod_tree_node mtn;
+#endif
+};
+
+#ifdef CONFIG_MODULES_TREE_LOOKUP
+/* Only touch one cacheline for common rbtree-for-core-layout case. */
+#define __module_layout_align ____cacheline_aligned
+#else
+#define __module_layout_align
+#endif
+
 struct module {
 	enum module_state state;
 
@@ -366,37 +388,9 @@ struct module {
 	/* Startup function. */
 	int (*init)(void);
 
-	/*
-	 * If this is non-NULL, vfree() after init() returns.
-	 *
-	 * Cacheline align here, such that:
-	 *   module_init, module_core, init_size, core_size,
-	 *   init_text_size, core_text_size and mtn_core::{mod,node[0]}
-	 * are on the same cacheline.
-	 */
-	void *module_init	____cacheline_aligned;
-
-	/* Here is the actual code + data, vfree'd on unload. */
-	void *module_core;
-
-	/* Here are the sizes of the init and core sections */
-	unsigned int init_size, core_size;
-
-	/* The size of the executable code in each section.  */
-	unsigned int init_text_size, core_text_size;
-
-#ifdef CONFIG_MODULES_TREE_LOOKUP
-	/*
-	 * We want mtn_core::{mod,node[0]} to be in the same cacheline as the
-	 * above entries such that a regular lookup will only touch one
-	 * cacheline.
-	 */
-	struct mod_tree_node	mtn_core;
-	struct mod_tree_node	mtn_init;
-#endif
-
-	/* Size of RO sections of the module (text+rodata) */
-	unsigned int init_ro_size, core_ro_size;
+	/* Core layout: rbtree is accessed frequently, so keep together. */
+	struct module_layout core_layout __module_layout_align;
+	struct module_layout init_layout;
 
 	/* Arch-specific module values */
 	struct mod_arch_specific arch;
@@ -505,15 +499,15 @@ bool is_module_text_address(unsigned long addr);
 static inline bool within_module_core(unsigned long addr,
 				      const struct module *mod)
 {
-	return (unsigned long)mod->module_core <= addr &&
-	       addr < (unsigned long)mod->module_core + mod->core_size;
+	return (unsigned long)mod->core_layout.base <= addr &&
+	       addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 }
 
 static inline bool within_module_init(unsigned long addr,
 				      const struct module *mod)
 {
-	return (unsigned long)mod->module_init <= addr &&
-	       addr < (unsigned long)mod->module_init + mod->init_size;
+	return (unsigned long)mod->init_layout.base <= addr &&
+	       addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 }
 
 static inline bool within_module(unsigned long addr, const struct module *mod)
@@ -768,9 +762,13 @@ extern int module_sysfs_initialized;
 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
 extern void set_all_modules_text_rw(void);
 extern void set_all_modules_text_ro(void);
+extern void module_enable_ro(const struct module *mod);
+extern void module_disable_ro(const struct module *mod);
 #else
 static inline void set_all_modules_text_rw(void) { }
 static inline void set_all_modules_text_ro(void) { }
+static inline void module_enable_ro(const struct module *mod) { }
+static inline void module_disable_ro(const struct module *mod) { }
 #endif
 
 #ifdef CONFIG_GENERIC_BUG