1 files changed, 31 insertions, 28 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
index 482efc865acf..515d53ae6a79 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -17,7 +17,7 @@
 #include <linux/moduleparam.h>
 #include <linux/tracepoint.h>
 
-#include <asm/local.h>
+#include <linux/percpu.h>
 #include <asm/module.h>
 
 #include <trace/events/module.h>
@@ -25,8 +25,10 @@
 /* Not Yet Implemented */
 #define MODULE_SUPPORTED_DEVICE(name)
 
-/* some toolchains uses a `_' prefix for all user symbols */
-#ifndef MODULE_SYMBOL_PREFIX
+/* Some toolchains use a `_' prefix for all user symbols. */
+#ifdef CONFIG_SYMBOL_PREFIX
+#define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
+#else
 #define MODULE_SYMBOL_PREFIX ""
 #endif
 
@@ -173,6 +175,7 @@ struct notifier_block;
 
 #ifdef CONFIG_MODULES
 
+extern int modules_disabled; /* for sysctl */
 /* Get/put a kernel symbol (calls must be symmetric) */
 void *__symbol_get(const char *symbol);
 void *__symbol_get_gpl(const char *symbol);
@@ -327,8 +330,11 @@ struct module
         struct module_notes_attrs *notes_attrs;
 #endif
 
+#ifdef CONFIG_SMP
         /* Per-cpu data. */
-        void *percpu;
+        void __percpu *percpu;
+        unsigned int percpu_size;
+#endif
 
         /* The command line arguments (may be mangled).  People like
            keeping pointers to this stuff */
@@ -361,11 +367,10 @@ struct module
         /* Destruction function. */
         void (*exit)(void);
 
-#ifdef CONFIG_SMP
-        char *refptr;
-#else
-        local_t ref;
-#endif
+        struct module_ref {
+                unsigned int incs;
+                unsigned int decs;
+        } __percpu *refptr;
 #endif
 
 #ifdef CONFIG_CONSTRUCTORS
@@ -391,6 +396,7 @@ static inline int module_is_live(struct module *mod)
 struct module *__module_text_address(unsigned long addr);
 struct module *__module_address(unsigned long addr);
 bool is_module_address(unsigned long addr);
+bool is_module_percpu_address(unsigned long addr);
 bool is_module_text_address(unsigned long addr);
 
 static inline int within_module_core(unsigned long addr, struct module *mod)
@@ -452,25 +458,16 @@ void __symbol_put(const char *symbol);
 #define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
 void symbol_put_addr(void *addr);
 
-static inline local_t *__module_ref_addr(struct module *mod, int cpu)
-{
-#ifdef CONFIG_SMP
-        return (local_t *) (mod->refptr + per_cpu_offset(cpu));
-#else
-        return &mod->ref;
-#endif
-}
-
 /* Sometimes we know we already have a refcount, and it's easier not
    to handle the error case (which only happens with rmmod --wait). */
 static inline void __module_get(struct module *module)
 {
         if (module) {
-                unsigned int cpu = get_cpu();
-                local_inc(__module_ref_addr(module, cpu));
+                preempt_disable();
+                __this_cpu_inc(module->refptr->incs);
                 trace_module_get(module, _THIS_IP_,
-                                 local_read(__module_ref_addr(module, cpu)));
-                put_cpu();
+                                 __this_cpu_read(module->refptr->incs));
+                preempt_enable();
         }
 }
 
@@ -479,15 +476,16 @@ static inline int try_module_get(struct module *module)
         int ret = 1;
 
         if (module) {
-                unsigned int cpu = get_cpu();
+                preempt_disable();
+
                 if (likely(module_is_live(module))) {
-                        local_inc(__module_ref_addr(module, cpu));
+                        __this_cpu_inc(module->refptr->incs);
                         trace_module_get(module, _THIS_IP_,
-                                local_read(__module_ref_addr(module, cpu)));
-                }
-                else
+                                __this_cpu_read(module->refptr->incs));
+                } else
                         ret = 0;
-                put_cpu();
+
+                preempt_enable();
         }
         return ret;
 }
@@ -569,6 +567,11 @@ static inline bool is_module_address(unsigned long addr)
         return false;
 }
 
+static inline bool is_module_percpu_address(unsigned long addr)
+{
+        return false;
+}
+
 static inline bool is_module_text_address(unsigned long addr)
 {
         return false;