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-rw-r--r--kernel/cgroup.c2
-rw-r--r--kernel/cpu.c2
-rw-r--r--kernel/debug/kdb/kdb_main.c12
-rw-r--r--kernel/exec_domain.c18
-rw-r--r--kernel/irq/manage.c3
-rw-r--r--kernel/module.c327
-rw-r--r--kernel/power/Kconfig9
-rw-r--r--kernel/power/Makefile2
-rw-r--r--kernel/power/nvs.c (renamed from kernel/power/hibernate_nvs.c)24
-rw-r--r--kernel/power/suspend.c6
-rw-r--r--kernel/sched.c157
-rw-r--r--kernel/sched_fair.c24
-rw-r--r--kernel/softirq.c2
-rw-r--r--kernel/stop_machine.c2
-rw-r--r--kernel/sysctl.c8
-rw-r--r--kernel/time/tick-sched.c5
-rw-r--r--kernel/timer.c2
17 files changed, 360 insertions, 245 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/irq/manage.c b/kernel/irq/manage.c
index 3164ba7ce151..e1497481fe8a 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -456,6 +456,9 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
desc->status |= flags;
+
+ if (chip != desc->chip)
+ irq_chip_set_defaults(desc->chip);
}
return ret;
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/power/Kconfig b/kernel/power/Kconfig
index 5c36ea9d55d2..ca6066a6952e 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -99,9 +99,13 @@ config PM_SLEEP_ADVANCED_DEBUG
depends on PM_ADVANCED_DEBUG
default n
+config SUSPEND_NVS
+ bool
+
config SUSPEND
bool "Suspend to RAM and standby"
depends on PM && ARCH_SUSPEND_POSSIBLE
+ select SUSPEND_NVS if HAS_IOMEM
default y
---help---
Allow the system to enter sleep states in which main memory is
@@ -130,13 +134,10 @@ config SUSPEND_FREEZER
Turning OFF this setting is NOT recommended! If in doubt, say Y.
-config HIBERNATION_NVS
- bool
-
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
- select HIBERNATION_NVS if HAS_IOMEM
+ select SUSPEND_NVS if HAS_IOMEM
---help---
Enable the suspend to disk (STD) functionality, which is usually
called "hibernation" in user interfaces. STD checkpoints the
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 524e058dcf06..f9063c6b185d 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -10,6 +10,6 @@ obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
block_io.o
-obj-$(CONFIG_HIBERNATION_NVS) += hibernate_nvs.o
+obj-$(CONFIG_SUSPEND_NVS) += nvs.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
diff --git a/kernel/power/hibernate_nvs.c b/kernel/power/nvs.c
index fdcad9ed5a7b..1836db60bbb6 100644
--- a/kernel/power/hibernate_nvs.c
+++ b/kernel/power/nvs.c
@@ -15,7 +15,7 @@
/*
* Platforms, like ACPI, may want us to save some memory used by them during
- * hibernation and to restore the contents of this memory during the subsequent
+ * suspend and to restore the contents of this memory during the subsequent
* resume. The code below implements a mechanism allowing us to do that.
*/
@@ -30,7 +30,7 @@ struct nvs_page {
static LIST_HEAD(nvs_list);
/**
- * hibernate_nvs_register - register platform NVS memory region to save
+ * suspend_nvs_register - register platform NVS memory region to save
* @start - physical address of the region
* @size - size of the region
*
@@ -38,7 +38,7 @@ static LIST_HEAD(nvs_list);
* things so that the data from page-aligned addresses in this region will
* be copied into separate RAM pages.
*/
-int hibernate_nvs_register(unsigned long start, unsigned long size)
+int suspend_nvs_register(unsigned long start, unsigned long size)
{
struct nvs_page *entry, *next;
@@ -68,9 +68,9 @@ int hibernate_nvs_register(unsigned long start, unsigned long size)
}
/**
- * hibernate_nvs_free - free data pages allocated for saving NVS regions
+ * suspend_nvs_free - free data pages allocated for saving NVS regions
*/
-void hibernate_nvs_free(void)
+void suspend_nvs_free(void)
{
struct nvs_page *entry;
@@ -86,16 +86,16 @@ void hibernate_nvs_free(void)
}
/**
- * hibernate_nvs_alloc - allocate memory necessary for saving NVS regions
+ * suspend_nvs_alloc - allocate memory necessary for saving NVS regions
*/
-int hibernate_nvs_alloc(void)
+int suspend_nvs_alloc(void)
{
struct nvs_page *entry;
list_for_each_entry(entry, &nvs_list, node) {
entry->data = (void *)__get_free_page(GFP_KERNEL);
if (!entry->data) {
- hibernate_nvs_free();
+ suspend_nvs_free();
return -ENOMEM;
}
}
@@ -103,9 +103,9 @@ int hibernate_nvs_alloc(void)
}
/**
- * hibernate_nvs_save - save NVS memory regions
+ * suspend_nvs_save - save NVS memory regions
*/
-void hibernate_nvs_save(void)
+void suspend_nvs_save(void)
{
struct nvs_page *entry;
@@ -119,12 +119,12 @@ void hibernate_nvs_save(void)
}
/**
- * hibernate_nvs_restore - restore NVS memory regions
+ * suspend_nvs_restore - restore NVS memory regions
*
* This function is going to be called with interrupts disabled, so it
* cannot iounmap the virtual addresses used to access the NVS region.
*/
-void hibernate_nvs_restore(void)
+void suspend_nvs_restore(void)
{
struct nvs_page *entry;
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 56e7dbb8b996..f37cb7dd4402 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -16,6 +16,12 @@
#include <linux/cpu.h>
#include <linux/syscalls.h>
#include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
#include "power.h"
diff --git a/kernel/sched.c b/kernel/sched.c
index d48408142503..cb816e36cc8b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -306,52 +306,6 @@ static int init_task_group_load = INIT_TASK_GROUP_LOAD;
*/
struct task_group init_task_group;
-/* return group to which a task belongs */
-static inline struct task_group *task_group(struct task_struct *p)
-{
- struct task_group *tg;
-
-#ifdef CONFIG_CGROUP_SCHED
- tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
- struct task_group, css);
-#else
- tg = &init_task_group;
-#endif
- return tg;
-}
-
-/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
-static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
-{
- /*
- * Strictly speaking this rcu_read_lock() is not needed since the
- * task_group is tied to the cgroup, which in turn can never go away
- * as long as there are tasks attached to it.
- *
- * However since task_group() uses task_subsys_state() which is an
- * rcu_dereference() user, this quiets CONFIG_PROVE_RCU.
- */
- rcu_read_lock();
-#ifdef CONFIG_FAIR_GROUP_SCHED
- p->se.cfs_rq = task_group(p)->cfs_rq[cpu];
- p->se.parent = task_group(p)->se[cpu];
-#endif
-
-#ifdef CONFIG_RT_GROUP_SCHED
- p->rt.rt_rq = task_group(p)->rt_rq[cpu];
- p->rt.parent = task_group(p)->rt_se[cpu];
-#endif
- rcu_read_unlock();
-}
-
-#else
-
-static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
-static inline struct task_group *task_group(struct task_struct *p)
-{
- return NULL;
-}
-
#endif /* CONFIG_CGROUP_SCHED */
/* CFS-related fields in a runqueue */
@@ -544,6 +498,8 @@ 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;
@@ -642,6 +598,49 @@ static inline int cpu_of(struct rq *rq)
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define raw_rq() (&__raw_get_cpu_var(runqueues))
+#ifdef CONFIG_CGROUP_SCHED
+
+/*
+ * Return the group to which this tasks belongs.
+ *
+ * We use task_subsys_state_check() and extend the RCU verification
+ * with lockdep_is_held(&task_rq(p)->lock) because cpu_cgroup_attach()
+ * holds that lock for each task it moves into the cgroup. Therefore
+ * by holding that lock, we pin the task to the current cgroup.
+ */
+static inline struct task_group *task_group(struct task_struct *p)
+{
+ struct cgroup_subsys_state *css;
+
+ css = task_subsys_state_check(p, cpu_cgroup_subsys_id,
+ lockdep_is_held(&task_rq(p)->lock));
+ return container_of(css, struct task_group, css);
+}
+
+/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
+static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
+{
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ p->se.cfs_rq = task_group(p)->cfs_rq[cpu];
+ p->se.parent = task_group(p)->se[cpu];
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ p->rt.rt_rq = task_group(p)->rt_rq[cpu];
+ p->rt.parent = task_group(p)->rt_se[cpu];
+#endif
+}
+
+#else /* CONFIG_CGROUP_SCHED */
+
+static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
+static inline struct task_group *task_group(struct task_struct *p)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_CGROUP_SCHED */
+
inline void update_rq_clock(struct rq *rq)
{
if (!rq->skip_clock_update)
@@ -1255,6 +1254,12 @@ static void sched_avg_update(struct rq *rq)
s64 period = sched_avg_period();
while ((s64)(rq->clock - rq->age_stamp) > period) {
+ /*
+ * Inline assembly required to prevent the compiler
+ * optimising this loop into a divmod call.
+ * See __iter_div_u64_rem() for another example of this.
+ */
+ asm("" : "+rm" (rq->age_stamp));
rq->age_stamp += period;
rq->rt_avg /= 2;
}
@@ -1499,24 +1504,9 @@ 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);
@@ -1673,9 +1663,6 @@ static void update_shares(struct sched_domain *sd)
static void update_h_load(long cpu)
{
- if (root_task_group_empty())
- return;
-
walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);
}
@@ -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;
}
@@ -2507,7 +2494,16 @@ void sched_fork(struct task_struct *p, int clone_flags)
if (p->sched_class->task_fork)
p->sched_class->task_fork(p);
+ /*
+ * The child is not yet in the pid-hash so no cgroup attach races,
+ * and the cgroup is pinned to this child due to cgroup_fork()
+ * is ran before sched_fork().
+ *
+ * Silence PROVE_RCU.
+ */
+ rcu_read_lock();
set_task_cpu(p, cpu);
+ rcu_read_unlock();
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
if (likely(sched_info_on()))
@@ -4478,16 +4474,6 @@ recheck:
}
if (user) {
-#ifdef CONFIG_RT_GROUP_SCHED
- /*
- * Do not allow realtime tasks into groups that have no runtime
- * assigned.
- */
- if (rt_bandwidth_enabled() && rt_policy(policy) &&
- task_group(p)->rt_bandwidth.rt_runtime == 0)
- return -EPERM;
-#endif
-
retval = security_task_setscheduler(p, policy, param);
if (retval)
return retval;
@@ -4503,6 +4489,22 @@ recheck:
* runqueue lock must be held.
*/
rq = __task_rq_lock(p);
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ if (user) {
+ /*
+ * Do not allow realtime tasks into groups that have no runtime
+ * assigned.
+ */
+ if (rt_bandwidth_enabled() && rt_policy(policy) &&
+ task_group(p)->rt_bandwidth.rt_runtime == 0) {
+ __task_rq_unlock(rq);
+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
+ return -EPERM;
+ }
+ }
+#endif
+
/* recheck policy now with rq lock held */
if (unlikely(oldpolicy != -1 && oldpolicy != p->policy)) {
policy = oldpolicy = -1;
@@ -7605,6 +7607,7 @@ 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..a878b5332daa 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;
@@ -1241,6 +1240,7 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)
* effect of the currently running task from the load
* of the current CPU:
*/
+ rcu_read_lock();
if (sync) {
tg = task_group(current);
weight = current->se.load.weight;
@@ -1252,8 +1252,6 @@ 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 +1261,22 @@ 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;
+ rcu_read_unlock();
/*
* If the currently running task will sleep within
@@ -2298,6 +2309,7 @@ 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/time/tick-sched.c b/kernel/time/tick-sched.c
index 1d7b9bc1c034..783fbadf2202 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -315,9 +315,6 @@ void tick_nohz_stop_sched_tick(int inidle)
goto end;
}
- if (nohz_ratelimit(cpu))
- goto end;
-
ts->idle_calls++;
/* Read jiffies and the time when jiffies were updated last */
do {
@@ -328,7 +325,7 @@ void tick_nohz_stop_sched_tick(int inidle)
} while (read_seqretry(&xtime_lock, seq));
if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu) ||
- arch_needs_cpu(cpu)) {
+ arch_needs_cpu(cpu) || nohz_ratelimit(cpu)) {
next_jiffies = last_jiffies + 1;
delta_jiffies = 1;
} else {
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);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 07:14:28 +0000