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Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

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* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  module: convert to stop_machine_create/destroy.
  stop_machine: introduce stop_machine_create/destroy.
  parisc: fix module loading failure of large kernel modules
  module: fix module loading failure of large kernel modules for parisc
  module: fix warning of unused function when !CONFIG_PROC_FS
  kernel/module.c: compare symbol values when marking symbols as exported in /proc/kallsyms.
  remove CONFIG_KMOD
This commit is contained in:
Linus Torvalds
2009-01-05 19:03:39 -08:00
parent 0578c3b4d4 9e01892c42
commit 0bbb275358
8 changed files with 258 additions and 115 deletions
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6
kernel/cpu.c
View File

@@ -269,8 +269,11 @@ out_release:
int __ref cpu_down(unsigned int cpu)
{
int err = 0;
int err;
err = stop_machine_create();
if (err)
return err;
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
@@ -297,6 +300,7 @@ int __ref cpu_down(unsigned int cpu)
out:
cpu_maps_update_done();
stop_machine_destroy();
return err;
}
EXPORT_SYMBOL(cpu_down);

59
kernel/module.c
View File

@@ -757,8 +757,16 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
return -EFAULT;
name[MODULE_NAME_LEN-1] = '\0';
if (mutex_lock_interruptible(&module_mutex) != 0)
return -EINTR;
/* Create stop_machine threads since free_module relies on
* a non-failing stop_machine call. */
ret = stop_machine_create();
if (ret)
return ret;
if (mutex_lock_interruptible(&module_mutex) != 0) {
ret = -EINTR;
goto out_stop;
}
mod = find_module(name);
if (!mod) {
@@ -817,10 +825,12 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
out:
mutex_unlock(&module_mutex);
out_stop:
stop_machine_destroy();
return ret;
}
static void print_unload_info(struct seq_file *m, struct module *mod)
static inline void print_unload_info(struct seq_file *m, struct module *mod)
{
struct module_use *use;
int printed_something = 0;
@@ -893,7 +903,7 @@ void module_put(struct module *module)
EXPORT_SYMBOL(module_put);
#else /* !CONFIG_MODULE_UNLOAD */
static void print_unload_info(struct seq_file *m, struct module *mod)
static inline void print_unload_info(struct seq_file *m, struct module *mod)
{
/* We don't know the usage count, or what modules are using. */
seq_printf(m, " - -");
@@ -1578,11 +1588,21 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
return ret;
}
/* Additional bytes needed by arch in front of individual sections */
unsigned int __weak arch_mod_section_prepend(struct module *mod,
unsigned int section)
{
/* default implementation just returns zero */
return 0;
}
/* Update size with this section: return offset. */
static long get_offset(unsigned int *size, Elf_Shdr *sechdr)
static long get_offset(struct module *mod, unsigned int *size,
Elf_Shdr *sechdr, unsigned int section)
{
long ret;
*size += arch_mod_section_prepend(mod, section);
ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
*size = ret + sechdr->sh_size;
return ret;
@@ -1622,7 +1642,7 @@ static void layout_sections(struct module *mod,
|| strncmp(secstrings + s->sh_name,
".init", 5) == 0)
continue;
s->sh_entsize = get_offset(&mod->core_size, s);
s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
DEBUGP("\t%s\n", secstrings + s->sh_name);
}
if (m == 0)
@@ -1640,7 +1660,7 @@ static void layout_sections(struct module *mod,
|| strncmp(secstrings + s->sh_name,
".init", 5) != 0)
continue;
s->sh_entsize = (get_offset(&mod->init_size, s)
s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
| INIT_OFFSET_MASK);
DEBUGP("\t%s\n", secstrings + s->sh_name);
}
@@ -1725,15 +1745,15 @@ static const struct kernel_symbol *lookup_symbol(const char *name,
return NULL;
}
static int is_exported(const char *name, const struct module *mod)
static int is_exported(const char *name, unsigned long value,
const struct module *mod)
{
if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
return 1;
const struct kernel_symbol *ks;
if (!mod)
ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
else
if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
return 1;
else
return 0;
ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
return ks != NULL && ks->value == value;
}
/* As per nm */
@@ -1865,6 +1885,13 @@ static noinline struct module *load_module(void __user *umod,
/* vmalloc barfs on "unusual" numbers. Check here */
if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
return ERR_PTR(-ENOMEM);
/* Create stop_machine threads since the error path relies on
* a non-failing stop_machine call. */
err = stop_machine_create();
if (err)
goto free_hdr;
if (copy_from_user(hdr, umod, len) != 0) {
err = -EFAULT;
goto free_hdr;
@@ -2248,6 +2275,7 @@ static noinline struct module *load_module(void __user *umod,
/* Get rid of temporary copy */
vfree(hdr);
stop_machine_destroy();
/* Done! */
return mod;
@@ -2270,6 +2298,7 @@ static noinline struct module *load_module(void __user *umod,
kfree(args);
free_hdr:
vfree(hdr);
stop_machine_destroy();
return ERR_PTR(err);
truncated:
@@ -2504,7 +2533,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
KSYM_NAME_LEN);
strlcpy(module_name, mod->name, MODULE_NAME_LEN);
*exported = is_exported(name, mod);
*exported = is_exported(name, *value, mod);
preempt_enable();
return 0;
}

55
kernel/stop_machine.c
View File

@@ -38,7 +38,10 @@ struct stop_machine_data {
static unsigned int num_threads;
static atomic_t thread_ack;
static DEFINE_MUTEX(lock);
/* setup_lock protects refcount, stop_machine_wq and stop_machine_work. */
static DEFINE_MUTEX(setup_lock);
/* Users of stop_machine. */
static int refcount;
static struct workqueue_struct *stop_machine_wq;
static struct stop_machine_data active, idle;
static const cpumask_t *active_cpus;
@@ -109,6 +112,43 @@ static int chill(void *unused)
return 0;
}
int stop_machine_create(void)
{
mutex_lock(&setup_lock);
if (refcount)
goto done;
stop_machine_wq = create_rt_workqueue("kstop");
if (!stop_machine_wq)
goto err_out;
stop_machine_work = alloc_percpu(struct work_struct);
if (!stop_machine_work)
goto err_out;
done:
refcount++;
mutex_unlock(&setup_lock);
return 0;
err_out:
if (stop_machine_wq)
destroy_workqueue(stop_machine_wq);
mutex_unlock(&setup_lock);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(stop_machine_create);
void stop_machine_destroy(void)
{
mutex_lock(&setup_lock);
refcount--;
if (refcount)
goto done;
destroy_workqueue(stop_machine_wq);
free_percpu(stop_machine_work);
done:
mutex_unlock(&setup_lock);
}
EXPORT_SYMBOL_GPL(stop_machine_destroy);
int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
{
struct work_struct *sm_work;
@@ -146,19 +186,14 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
{
int ret;
ret = stop_machine_create();
if (ret)
return ret;
/* No CPUs can come up or down during this. */
get_online_cpus();
ret = __stop_machine(fn, data, cpus);
put_online_cpus();
stop_machine_destroy();
return ret;
}
EXPORT_SYMBOL_GPL(stop_machine);
static int __init stop_machine_init(void)
{
stop_machine_wq = create_rt_workqueue("kstop");
stop_machine_work = alloc_percpu(struct work_struct);
return 0;
}
core_initcall(stop_machine_init);