Merge commit 'v2.6.35-rc3' into perf/core

Merge reason: Go from -rc1 base to -rc3 base, merge in fixes.

11 files changed, 256 insertions, 165 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 422cb19f156e..3ac6f5b0a64b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4598,7 +4598,7 @@ static int alloc_css_id(struct cgroup_subsys *ss, struct cgroup *parent,
         parent_css = parent->subsys[subsys_id];
         child_css = child->subsys[subsys_id];
         parent_id = parent_css->id;
-        depth = parent_id->depth;
+        depth = parent_id->depth + 1;
 
         child_id = get_new_cssid(ss, depth);
         if (IS_ERR(child_id))
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8b92539b4754..97d1b426a4ac 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -34,7 +34,7 @@ void cpu_maps_update_done(void)
         mutex_unlock(&cpu_add_remove_lock);
 }
 
-static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain);
+static RAW_NOTIFIER_HEAD(cpu_chain);
 
 /* If set, cpu_up and cpu_down will return -EBUSY and do nothing.
  * Should always be manipulated under cpu_add_remove_lock
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index b724c791b6d4..184cd8209c36 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1857,12 +1857,6 @@ static int kdb_ef(int argc, const char **argv)
 }
 
 #if defined(CONFIG_MODULES)
-/* modules using other modules */
-struct module_use {
-        struct list_head list;
-        struct module *module_which_uses;
-};
-
 /*
  * kdb_lsmod - This function implements the 'lsmod' command.  Lists
  *      currently loaded kernel modules.
@@ -1894,9 +1888,9 @@ static int kdb_lsmod(int argc, const char **argv)
                 {
                         struct module_use *use;
                         kdb_printf(" [ ");
-                        list_for_each_entry(use, &mod->modules_which_use_me,
-                                            list)
-                                kdb_printf("%s ", use->module_which_uses->name);
+                        list_for_each_entry(use, &mod->source_list,
+                                            source_list)
+                                kdb_printf("%s ", use->target->name);
                         kdb_printf("]\n");
                 }
 #endif
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index c35452cadded..dd62f8e714ca 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -27,7 +27,7 @@ static struct exec_domain *exec_domains = &default_exec_domain;
 static DEFINE_RWLOCK(exec_domains_lock);
 
 
-static u_long ident_map[32] = {
+static unsigned long ident_map[32] = {
         0,      1,      2,      3,      4,      5,      6,      7,
         8,      9,      10,     11,     12,     13,     14,     15,
         16,     17,     18,     19,     20,     21,     22,     23,
@@ -56,10 +56,10 @@ default_handler(int segment, struct pt_regs *regp)
 }
 
 static struct exec_domain *
-lookup_exec_domain(u_long personality)
+lookup_exec_domain(unsigned int personality)
 {
-        struct exec_domain *    ep;
-        u_long                  pers = personality(personality);
+        unsigned int pers = personality(personality);
+        struct exec_domain *ep;
 
         read_lock(&exec_domains_lock);
         for (ep = exec_domains; ep; ep = ep->next) {
@@ -70,7 +70,7 @@ lookup_exec_domain(u_long personality)
 
 #ifdef CONFIG_MODULES
         read_unlock(&exec_domains_lock);
-        request_module("personality-%ld", pers);
+        request_module("personality-%d", pers);
         read_lock(&exec_domains_lock);
 
         for (ep = exec_domains; ep; ep = ep->next) {
@@ -135,7 +135,7 @@ unregister:
 }
 
 int
-__set_personality(u_long personality)
+__set_personality(unsigned int personality)
 {
         struct exec_domain      *ep, *oep;
 
@@ -188,9 +188,9 @@ static int __init proc_execdomains_init(void)
 module_init(proc_execdomains_init);
 #endif
 
-SYSCALL_DEFINE1(personality, u_long, personality)
+SYSCALL_DEFINE1(personality, unsigned int, personality)
 {
-        u_long old = current->personality;
+        unsigned int old = current->personality;
 
         if (personality != 0xffffffff) {
                 set_personality(personality);
@@ -198,7 +198,7 @@ SYSCALL_DEFINE1(personality, u_long, personality)
                         return -EINVAL;
         }
 
-        return (long)old;
+        return old;
 }
 
 
diff --git a/kernel/module.c b/kernel/module.c
index 333fbcc96978..8c6b42840dd1 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -72,7 +72,11 @@
 /* If this is set, the section belongs in the init part of the module */
 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
 
-/* List of modules, protected by module_mutex or preempt_disable
+/*
+ * Mutex protects:
+ * 1) List of modules (also safely readable with preempt_disable),
+ * 2) module_use links,
+ * 3) module_addr_min/module_addr_max.
  * (delete uses stop_machine/add uses RCU list operations). */
 DEFINE_MUTEX(module_mutex);
 EXPORT_SYMBOL_GPL(module_mutex);
@@ -90,7 +94,8 @@ static DECLARE_WAIT_QUEUE_HEAD(module_wq);
 
 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
 
-/* Bounds of module allocation, for speeding __module_address */
+/* Bounds of module allocation, for speeding __module_address.
+ * Protected by module_mutex. */
 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
 
 int register_module_notifier(struct notifier_block * nb)
@@ -329,7 +334,7 @@ static bool find_symbol_in_section(const struct symsearch *syms,
 }
 
 /* Find a symbol and return it, along with, (optional) crc and
- * (optional) module which owns it */
+ * (optional) module which owns it.  Needs preempt disabled or module_mutex. */
 const struct kernel_symbol *find_symbol(const char *name,
                                         struct module **owner,
                                         const unsigned long **crc,
@@ -403,7 +408,7 @@ static unsigned int find_pcpusec(Elf_Ehdr *hdr,
                                  Elf_Shdr *sechdrs,
                                  const char *secstrings)
 {
-        return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
+        return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
 }
 
 static void percpu_modcopy(struct module *mod,
@@ -523,7 +528,8 @@ static void module_unload_init(struct module *mod)
 {
         int cpu;
 
-        INIT_LIST_HEAD(&mod->modules_which_use_me);
+        INIT_LIST_HEAD(&mod->source_list);
+        INIT_LIST_HEAD(&mod->target_list);
         for_each_possible_cpu(cpu) {
                 per_cpu_ptr(mod->refptr, cpu)->incs = 0;
                 per_cpu_ptr(mod->refptr, cpu)->decs = 0;
@@ -535,20 +541,13 @@ static void module_unload_init(struct module *mod)
         mod->waiter = current;
 }
 
-/* modules using other modules */
-struct module_use
-{
-        struct list_head list;
-        struct module *module_which_uses;
-};
-
 /* Does a already use b? */
 static int already_uses(struct module *a, struct module *b)
 {
         struct module_use *use;
 
-        list_for_each_entry(use, &b->modules_which_use_me, list) {
-                if (use->module_which_uses == a) {
+        list_for_each_entry(use, &b->source_list, source_list) {
+                if (use->source == a) {
                         DEBUGP("%s uses %s!\n", a->name, b->name);
                         return 1;
                 }
@@ -557,62 +556,68 @@ static int already_uses(struct module *a, struct module *b)
         return 0;
 }
 
-/* Module a uses b */
-int use_module(struct module *a, struct module *b)
+/*
+ * Module a uses b
+ *  - we add 'a' as a "source", 'b' as a "target" of module use
+ *  - the module_use is added to the list of 'b' sources (so
+ *    'b' can walk the list to see who sourced them), and of 'a'
+ *    targets (so 'a' can see what modules it targets).
+ */
+static int add_module_usage(struct module *a, struct module *b)
 {
         struct module_use *use;
-        int no_warn, err;
 
-        if (b == NULL || already_uses(a, b)) return 1;
+        DEBUGP("Allocating new usage for %s.\n", a->name);
+        use = kmalloc(sizeof(*use), GFP_ATOMIC);
+        if (!use) {
+                printk(KERN_WARNING "%s: out of memory loading\n", a->name);
+                return -ENOMEM;
+        }
+
+        use->source = a;
+        use->target = b;
+        list_add(&use->source_list, &b->source_list);
+        list_add(&use->target_list, &a->target_list);
+        return 0;
+}
+
+/* Module a uses b: caller needs module_mutex() */
+int ref_module(struct module *a, struct module *b)
+{
+        int err;
 
-        /* If we're interrupted or time out, we fail. */
-        if (wait_event_interruptible_timeout(
-                    module_wq, (err = strong_try_module_get(b)) != -EBUSY,
-                    30 * HZ) <= 0) {
-                printk("%s: gave up waiting for init of module %s.\n",
-                       a->name, b->name);
+        if (b == NULL || already_uses(a, b))
                 return 0;
-        }
 
-        /* If strong_try_module_get() returned a different error, we fail. */
+        /* If module isn't available, we fail. */
+        err = strong_try_module_get(b);
         if (err)
-                return 0;
+                return err;
 
-        DEBUGP("Allocating new usage for %s.\n", a->name);
-        use = kmalloc(sizeof(*use), GFP_ATOMIC);
-        if (!use) {
-                printk("%s: out of memory loading\n", a->name);
+        err = add_module_usage(a, b);
+        if (err) {
                 module_put(b);
-                return 0;
+                return err;
         }
-
-        use->module_which_uses = a;
-        list_add(&use->list, &b->modules_which_use_me);
-        no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
-        return 1;
+        return 0;
 }
-EXPORT_SYMBOL_GPL(use_module);
+EXPORT_SYMBOL_GPL(ref_module);
 
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
 {
-        struct module *i;
+        struct module_use *use, *tmp;
 
-        list_for_each_entry(i, &modules, list) {
-                struct module_use *use;
-
-                list_for_each_entry(use, &i->modules_which_use_me, list) {
-                        if (use->module_which_uses == mod) {
-                                DEBUGP("%s unusing %s\n", mod->name, i->name);
-                                module_put(i);
-                                list_del(&use->list);
-                                kfree(use);
-                                sysfs_remove_link(i->holders_dir, mod->name);
-                                /* There can be at most one match. */
-                                break;
-                        }
-                }
+        mutex_lock(&module_mutex);
+        list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
+                struct module *i = use->target;
+                DEBUGP("%s unusing %s\n", mod->name, i->name);
+                module_put(i);
+                list_del(&use->source_list);
+                list_del(&use->target_list);
+                kfree(use);
         }
+        mutex_unlock(&module_mutex);
 }
 
 #ifdef CONFIG_MODULE_FORCE_UNLOAD
@@ -735,7 +740,7 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
                 goto out;
         }
 
-        if (!list_empty(&mod->modules_which_use_me)) {
+        if (!list_empty(&mod->source_list)) {
                 /* Other modules depend on us: get rid of them first. */
                 ret = -EWOULDBLOCK;
                 goto out;
@@ -779,13 +784,14 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
         blocking_notifier_call_chain(&module_notify_list,
                                      MODULE_STATE_GOING, mod);
         async_synchronize_full();
-        mutex_lock(&module_mutex);
+
         /* Store the name of the last unloaded module for diagnostic purposes */
         strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
         ddebug_remove_module(mod->name);
-        free_module(mod);
 
- out:
+        free_module(mod);
+        return 0;
+out:
         mutex_unlock(&module_mutex);
         return ret;
 }
@@ -799,9 +805,9 @@ static inline void print_unload_info(struct seq_file *m, struct module *mod)
 
         /* Always include a trailing , so userspace can differentiate
            between this and the old multi-field proc format. */
-        list_for_each_entry(use, &mod->modules_which_use_me, list) {
+        list_for_each_entry(use, &mod->source_list, source_list) {
                 printed_something = 1;
-                seq_printf(m, "%s,", use->module_which_uses->name);
+                seq_printf(m, "%s,", use->source->name);
         }
 
         if (mod->init != NULL && mod->exit == NULL) {
@@ -880,11 +886,11 @@ static inline void module_unload_free(struct module *mod)
 {
 }
 
-int use_module(struct module *a, struct module *b)
+int ref_module(struct module *a, struct module *b)
 {
-        return strong_try_module_get(b) == 0;
+        return strong_try_module_get(b);
 }
-EXPORT_SYMBOL_GPL(use_module);
+EXPORT_SYMBOL_GPL(ref_module);
 
 static inline void module_unload_init(struct module *mod)
 {
@@ -1001,6 +1007,8 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
 {
         const unsigned long *crc;
 
+        /* Since this should be found in kernel (which can't be removed),
+         * no locking is necessary. */
         if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
                          &crc, true, false))
                 BUG();
@@ -1043,29 +1051,62 @@ static inline int same_magic(const char *amagic, const char *bmagic,
 }
 #endif /* CONFIG_MODVERSIONS */
 
-/* Resolve a symbol for this module.  I.e. if we find one, record usage.
-   Must be holding module_mutex. */
+/* Resolve a symbol for this module.  I.e. if we find one, record usage. */
 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
                                                   unsigned int versindex,
                                                   const char *name,
-                                                  struct module *mod)
+                                                  struct module *mod,
+                                                  char ownername[])
 {
         struct module *owner;
         const struct kernel_symbol *sym;
         const unsigned long *crc;
+        int err;
 
+        mutex_lock(&module_mutex);
         sym = find_symbol(name, &owner, &crc,
                           !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
-        /* use_module can fail due to OOM,
-           or module initialization or unloading */
-        if (sym) {
-                if (!check_version(sechdrs, versindex, name, mod, crc, owner)
-                    || !use_module(mod, owner))
-                        sym = NULL;
+        if (!sym)
+                goto unlock;
+
+        if (!check_version(sechdrs, versindex, name, mod, crc, owner)) {
+                sym = ERR_PTR(-EINVAL);
+                goto getname;
+        }
+
+        err = ref_module(mod, owner);
+        if (err) {
+                sym = ERR_PTR(err);
+                goto getname;
         }
+
+getname:
+        /* We must make copy under the lock if we failed to get ref. */
+        strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
+unlock:
+        mutex_unlock(&module_mutex);
         return sym;
 }
 
+static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
+                                                       unsigned int versindex,
+                                                       const char *name,
+                                                       struct module *mod)
+{
+        const struct kernel_symbol *ksym;
+        char ownername[MODULE_NAME_LEN];
+
+        if (wait_event_interruptible_timeout(module_wq,
+                        !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name,
+                                                      mod, ownername)) ||
+                        PTR_ERR(ksym) != -EBUSY,
+                                             30 * HZ) <= 0) {
+                printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
+                       mod->name, ownername);
+        }
+        return ksym;
+}
+
 /*
  * /sys/module/foo/sections stuff
  * J. Corbet <corbet@lwn.net>
@@ -1295,7 +1336,34 @@ static inline void remove_notes_attrs(struct module *mod)
 #endif
 
 #ifdef CONFIG_SYSFS
-int module_add_modinfo_attrs(struct module *mod)
+static void add_usage_links(struct module *mod)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+        struct module_use *use;
+        int nowarn;
+
+        mutex_lock(&module_mutex);
+        list_for_each_entry(use, &mod->target_list, target_list) {
+                nowarn = sysfs_create_link(use->target->holders_dir,
+                                           &mod->mkobj.kobj, mod->name);
+        }
+        mutex_unlock(&module_mutex);
+#endif
+}
+
+static void del_usage_links(struct module *mod)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+        struct module_use *use;
+
+        mutex_lock(&module_mutex);
+        list_for_each_entry(use, &mod->target_list, target_list)
+                sysfs_remove_link(use->target->holders_dir, mod->name);
+        mutex_unlock(&module_mutex);
+#endif
+}
+
+static int module_add_modinfo_attrs(struct module *mod)
 {
         struct module_attribute *attr;
         struct module_attribute *temp_attr;
@@ -1321,7 +1389,7 @@ int module_add_modinfo_attrs(struct module *mod)
         return error;
 }
 
-void module_remove_modinfo_attrs(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod)
 {
         struct module_attribute *attr;
         int i;
@@ -1337,7 +1405,7 @@ void module_remove_modinfo_attrs(struct module *mod)
         kfree(mod->modinfo_attrs);
 }
 
-int mod_sysfs_init(struct module *mod)
+static int mod_sysfs_init(struct module *mod)
 {
         int err;
         struct kobject *kobj;
@@ -1371,12 +1439,16 @@ out:
         return err;
 }
 
-int mod_sysfs_setup(struct module *mod,
+static int mod_sysfs_setup(struct module *mod,
                            struct kernel_param *kparam,
                            unsigned int num_params)
 {
         int err;
 
+        err = mod_sysfs_init(mod);
+        if (err)
+                goto out;
+
         mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
         if (!mod->holders_dir) {
                 err = -ENOMEM;
@@ -1391,6 +1463,8 @@ int mod_sysfs_setup(struct module *mod,
         if (err)
                 goto out_unreg_param;
 
+        add_usage_links(mod);
+
         kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
         return 0;
 
@@ -1400,6 +1474,7 @@ out_unreg_holders:
         kobject_put(mod->holders_dir);
 out_unreg:
         kobject_put(&mod->mkobj.kobj);
+out:
         return err;
 }
 
@@ -1410,14 +1485,40 @@ static void mod_sysfs_fini(struct module *mod)
 
 #else /* CONFIG_SYSFS */
 
+static inline int mod_sysfs_init(struct module *mod)
+{
+        return 0;
+}
+
+static inline int mod_sysfs_setup(struct module *mod,
+                           struct kernel_param *kparam,
+                           unsigned int num_params)
+{
+        return 0;
+}
+
+static inline int module_add_modinfo_attrs(struct module *mod)
+{
+        return 0;
+}
+
+static inline void module_remove_modinfo_attrs(struct module *mod)
+{
+}
+
 static void mod_sysfs_fini(struct module *mod)
 {
 }
 
+static void del_usage_links(struct module *mod)
+{
+}
+
 #endif /* CONFIG_SYSFS */
 
 static void mod_kobject_remove(struct module *mod)
 {
+        del_usage_links(mod);
         module_remove_modinfo_attrs(mod);
         module_param_sysfs_remove(mod);
         kobject_put(mod->mkobj.drivers_dir);
@@ -1436,13 +1537,15 @@ static int __unlink_module(void *_mod)
         return 0;
 }
 
-/* Free a module, remove from lists, etc (must hold module_mutex). */
+/* Free a module, remove from lists, etc. */
 static void free_module(struct module *mod)
 {
         trace_module_free(mod);
 
         /* Delete from various lists */
+        mutex_lock(&module_mutex);
         stop_machine(__unlink_module, mod, NULL);
+        mutex_unlock(&module_mutex);
         remove_notes_attrs(mod);
         remove_sect_attrs(mod);
         mod_kobject_remove(mod);
@@ -1493,6 +1596,8 @@ EXPORT_SYMBOL_GPL(__symbol_get);
 /*
  * Ensure that an exported symbol [global namespace] does not already exist
  * in the kernel or in some other module's exported symbol table.
+ *
+ * You must hold the module_mutex.
  */
 static int verify_export_symbols(struct module *mod)
 {
@@ -1558,21 +1663,23 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
                         break;
 
                 case SHN_UNDEF:
-                        ksym = resolve_symbol(sechdrs, versindex,
-                                              strtab + sym[i].st_name, mod);
+                        ksym = resolve_symbol_wait(sechdrs, versindex,
+                                                   strtab + sym[i].st_name,
+                                                   mod);
                         /* Ok if resolved.  */
-                        if (ksym) {
+                        if (ksym && !IS_ERR(ksym)) {
                                 sym[i].st_value = ksym->value;
                                 break;
                         }
 
                         /* Ok if weak.  */
-                        if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
+                        if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
                                 break;
 
-                        printk(KERN_WARNING "%s: Unknown symbol %s\n",
-                               mod->name, strtab + sym[i].st_name);
-                        ret = -ENOENT;
+                        printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
+                               mod->name, strtab + sym[i].st_name,
+                               PTR_ERR(ksym));
+                        ret = PTR_ERR(ksym) ?: -ENOENT;
                         break;
 
                 default:
@@ -1960,11 +2067,13 @@ static void *module_alloc_update_bounds(unsigned long size)
         void *ret = module_alloc(size);
 
         if (ret) {
+                mutex_lock(&module_mutex);
                 /* Update module bounds. */
                 if ((unsigned long)ret < module_addr_min)
                         module_addr_min = (unsigned long)ret;
                 if ((unsigned long)ret + size > module_addr_max)
                         module_addr_max = (unsigned long)ret + size;
+                mutex_unlock(&module_mutex);
         }
         return ret;
 }
@@ -2014,6 +2123,7 @@ static noinline struct module *load_module(void __user *umod,
         long err = 0;
         void *ptr = NULL; /* Stops spurious gcc warning */
         unsigned long symoffs, stroffs, *strmap;
+        void __percpu *percpu;
 
         mm_segment_t old_fs;
 
@@ -2138,11 +2248,6 @@ static noinline struct module *load_module(void __user *umod,
                 goto free_mod;
         }
 
-        if (find_module(mod->name)) {
-                err = -EEXIST;
-                goto free_mod;
-        }
-
         mod->state = MODULE_STATE_COMING;
 
         /* Allow arches to frob section contents and sizes.  */
@@ -2158,6 +2263,8 @@ static noinline struct module *load_module(void __user *umod,
                         goto free_mod;
                 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
         }
+        /* Keep this around for failure path. */
+        percpu = mod_percpu(mod);
 
         /* Determine total sizes, and put offsets in sh_entsize.  For now
            this is done generically; there doesn't appear to be any
@@ -2231,11 +2338,6 @@ static noinline struct module *load_module(void __user *umod,
         /* Now we've moved module, initialize linked lists, etc. */
         module_unload_init(mod);
 
-        /* add kobject, so we can reference it. */
-        err = mod_sysfs_init(mod);
-        if (err)
-                goto free_unload;
-
         /* Set up license info based on the info section */
         set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
 
@@ -2360,11 +2462,6 @@ static noinline struct module *load_module(void __user *umod,
                         goto cleanup;
         }
 
-        /* Find duplicate symbols */
-        err = verify_export_symbols(mod);
-        if (err < 0)
-                goto cleanup;
-
         /* Set up and sort exception table */
         mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
                                     sizeof(*mod->extable), &mod->num_exentries);
@@ -2423,7 +2520,19 @@ static noinline struct module *load_module(void __user *umod,
          * function to insert in a way safe to concurrent readers.
          * The mutex protects against concurrent writers.
          */
+        mutex_lock(&module_mutex);
+        if (find_module(mod->name)) {
+                err = -EEXIST;
+                goto unlock;
+        }
+
+        /* Find duplicate symbols */
+        err = verify_export_symbols(mod);
+        if (err < 0)
+                goto unlock;
+
         list_add_rcu(&mod->list, &modules);
+        mutex_unlock(&module_mutex);
 
         err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
         if (err < 0)
@@ -2432,6 +2541,7 @@ static noinline struct module *load_module(void __user *umod,
         err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
         if (err < 0)
                 goto unlink;
+
         add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
         add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
 
@@ -2444,15 +2554,15 @@ static noinline struct module *load_module(void __user *umod,
         return mod;
 
  unlink:
+        mutex_lock(&module_mutex);
         /* Unlink carefully: kallsyms could be walking list. */
         list_del_rcu(&mod->list);
+ unlock:
+        mutex_unlock(&module_mutex);
         synchronize_sched();
         module_arch_cleanup(mod);
  cleanup:
         free_modinfo(mod);
-        kobject_del(&mod->mkobj.kobj);
-        kobject_put(&mod->mkobj.kobj);
- free_unload:
         module_unload_free(mod);
 #if defined(CONFIG_MODULE_UNLOAD)
         free_percpu(mod->refptr);
@@ -2463,7 +2573,7 @@ static noinline struct module *load_module(void __user *umod,
         module_free(mod, mod->module_core);
         /* mod will be freed with core. Don't access it beyond this line! */
  free_percpu:
-        percpu_modfree(mod);
+        free_percpu(percpu);
  free_mod:
         kfree(args);
         kfree(strmap);
@@ -2499,19 +2609,10 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
         if (!capable(CAP_SYS_MODULE) || modules_disabled)
                 return -EPERM;
 
-        /* Only one module load at a time, please */
-        if (mutex_lock_interruptible(&module_mutex) != 0)
-                return -EINTR;
-
         /* Do all the hard work */
         mod = load_module(umod, len, uargs);
-        if (IS_ERR(mod)) {
-                mutex_unlock(&module_mutex);
+        if (IS_ERR(mod))
                 return PTR_ERR(mod);
-        }
-
-        /* Drop lock so they can recurse */
-        mutex_unlock(&module_mutex);
 
         blocking_notifier_call_chain(&module_notify_list,
                         MODULE_STATE_COMING, mod);
@@ -2528,9 +2629,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
                 module_put(mod);
                 blocking_notifier_call_chain(&module_notify_list,
                                              MODULE_STATE_GOING, mod);
-                mutex_lock(&module_mutex);
                 free_module(mod);
-                mutex_unlock(&module_mutex);
                 wake_up(&module_wq);
                 return ret;
         }
diff --git a/kernel/sched.c b/kernel/sched.c
index d3c120f1bf53..3c5d34a4e932 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -544,6 +544,8 @@ struct rq {
         struct root_domain *rd;
         struct sched_domain *sd;
 
+        unsigned long cpu_power;
+
         unsigned char idle_at_tick;
         /* For active balancing */
         int post_schedule;
@@ -1499,24 +1501,9 @@ static unsigned long target_load(int cpu, int type)
         return max(rq->cpu_load[type-1], total);
 }
 
-static struct sched_group *group_of(int cpu)
-{
-        struct sched_domain *sd = rcu_dereference_sched(cpu_rq(cpu)->sd);
-
-        if (!sd)
-                return NULL;
-
-        return sd->groups;
-}
-
 static unsigned long power_of(int cpu)
 {
-        struct sched_group *group = group_of(cpu);
-
-        if (!group)
-                return SCHED_LOAD_SCALE;
-
-        return group->cpu_power;
+        return cpu_rq(cpu)->cpu_power;
 }
 
 static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
@@ -1854,8 +1841,8 @@ static void dec_nr_running(struct rq *rq)
 static void set_load_weight(struct task_struct *p)
 {
         if (task_has_rt_policy(p)) {
-                p->se.load.weight = prio_to_weight[0] * 2;
-                p->se.load.inv_weight = prio_to_wmult[0] >> 1;
+                p->se.load.weight = 0;
+                p->se.load.inv_weight = WMULT_CONST;
                 return;
         }
 
@@ -7605,6 +7592,7 @@ void __init sched_init(void)
 #ifdef CONFIG_SMP
                 rq->sd = NULL;
                 rq->rd = NULL;
+                rq->cpu_power = SCHED_LOAD_SCALE;
                 rq->post_schedule = 0;
                 rq->active_balance = 0;
                 rq->next_balance = jiffies;
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 217e4a9393e4..eed35eded602 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1225,7 +1225,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
         unsigned long this_load, load;
         int idx, this_cpu, prev_cpu;
         unsigned long tl_per_task;
-        unsigned int imbalance;
         struct task_group *tg;
         unsigned long weight;
         int balanced;
@@ -1252,8 +1251,6 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
         tg = task_group(p);
         weight = p->se.load.weight;
 
-        imbalance = 100 + (sd->imbalance_pct - 100) / 2;
-
         /*
          * In low-load situations, where prev_cpu is idle and this_cpu is idle
          * due to the sync cause above having dropped this_load to 0, we'll
@@ -1263,9 +1260,21 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
          * Otherwise check if either cpus are near enough in load to allow this
          * task to be woken on this_cpu.
          */
-        balanced = !this_load ||
-                100*(this_load + effective_load(tg, this_cpu, weight, weight)) <=
-                imbalance*(load + effective_load(tg, prev_cpu, 0, weight));
+        if (this_load) {
+                unsigned long this_eff_load, prev_eff_load;
+
+                this_eff_load = 100;
+                this_eff_load *= power_of(prev_cpu);
+                this_eff_load *= this_load +
+                        effective_load(tg, this_cpu, weight, weight);
+
+                prev_eff_load = 100 + (sd->imbalance_pct - 100) / 2;
+                prev_eff_load *= power_of(this_cpu);
+                prev_eff_load *= load + effective_load(tg, prev_cpu, 0, weight);
+
+                balanced = this_eff_load <= prev_eff_load;
+        } else
+                balanced = true;
 
         /*
          * If the currently running task will sleep within
@@ -2298,6 +2307,7 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
         if (!power)
                 power = 1;
 
+        cpu_rq(cpu)->cpu_power = power;
         sdg->cpu_power = power;
 }
 
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 825e1126008f..07b4f1b1a73a 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -850,7 +850,7 @@ static __init int spawn_ksoftirqd(void)
         void *cpu = (void *)(long)smp_processor_id();
         int err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
 
-        BUG_ON(err == NOTIFY_BAD);
+        BUG_ON(err != NOTIFY_OK);
         cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
         register_cpu_notifier(&cpu_nfb);
         return 0;
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index b4e7431e7c78..70f8d90331e9 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -321,7 +321,7 @@ static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb,
 
 #ifdef CONFIG_HOTPLUG_CPU
         case CPU_UP_CANCELED:
-        case CPU_DEAD:
+        case CPU_POST_DEAD:
         {
                 struct cpu_stop_work *work;
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 997080f00e0b..d24f761f4876 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1471,12 +1471,12 @@ static struct ctl_table fs_table[] = {
         },
 #endif
         {
-                .procname       = "pipe-max-pages",
-                .data           = &pipe_max_pages,
+                .procname       = "pipe-max-size",
+                .data           = &pipe_max_size,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec_minmax,
-                .extra1         = &two,
+                .proc_handler   = &pipe_proc_fn,
+                .extra1         = &pipe_min_size,
         },
 /*
  * NOTE: do not add new entries to this table unless you have read
diff --git a/kernel/timer.c b/kernel/timer.c
index 2454172a80d3..ee305c8d4e18 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1717,7 +1717,7 @@ void __init init_timers(void)
 
         init_timer_stats();
 
-        BUG_ON(err == NOTIFY_BAD);
+        BUG_ON(err != NOTIFY_OK);
         register_cpu_notifier(&timers_nb);
         open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
 }