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

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  stop_machine: fix error code handling on multiple cpus
  stop_machine: use workqueues instead of kernel threads
  workqueue: introduce create_rt_workqueue
  Call init_workqueues before pre smp initcalls.
  Make panic= and panic_on_oops into core_params
  Make initcall_debug a core_param
  core_param() for genuinely core kernel parameters
  param: Fix duplicate module prefixes
  module: check kernel param length at compile time, not runtime
  Remove stop_machine during module load v2
  module: simplify load_module.
This commit is contained in:
Linus Torvalds 2008-10-23 10:00:14 -07:00
parent 296e1ce0dc 8163bcac77
commit a534487606
9 changed files with 361 additions and 396 deletions
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6
include/linux/module.h
View File

@ -29,7 +29,7 @@
#define MODULE_SYMBOL_PREFIX ""
#endif
#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
#define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
struct kernel_symbol
{
@ -60,6 +60,7 @@ struct module_kobject
struct kobject kobj;
struct module *mod;
struct kobject *drivers_dir;
struct module_param_attrs *mp;
};
/* These are either module local, or the kernel's dummy ones. */
@ -242,7 +243,6 @@ struct module
/* Sysfs stuff. */
struct module_kobject mkobj;
struct module_param_attrs *param_attrs;
struct module_attribute *modinfo_attrs;
const char *version;
const char *srcversion;
@ -277,7 +277,7 @@ struct module
/* Exception table */
unsigned int num_exentries;
const struct exception_table_entry *extable;
struct exception_table_entry *extable;
/* Startup function. */
int (*init)(void);

25
include/linux/moduleparam.h
View File

@ -13,6 +13,9 @@
#define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
#endif
/* Chosen so that structs with an unsigned long line up. */
#define MAX_PARAM_PREFIX_LEN (64 - sizeof(unsigned long))
#ifdef MODULE
#define ___module_cat(a,b) __mod_ ## a ## b
#define __module_cat(a,b) ___module_cat(a,b)
@ -79,7 +82,8 @@ struct kparam_array
#define __module_param_call(prefix, name, set, get, arg, perm) \
/* Default value instead of permissions? */ \
static int __param_perm_check_##name __attribute__((unused)) = \
BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); \
BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)) \
+ BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN); \
static const char __param_str_##name[] = prefix #name; \
static struct kernel_param __moduleparam_const __param_##name \
__used \
@ -100,6 +104,25 @@ struct kparam_array
#define module_param(name, type, perm) \
module_param_named(name, name, type, perm)
#ifndef MODULE
/**
* core_param - define a historical core kernel parameter.
* @name: the name of the cmdline and sysfs parameter (often the same as var)
* @var: the variable
* @type: the type (for param_set_##type and param_get_##type)
* @perm: visibility in sysfs
*
* core_param is just like module_param(), but cannot be modular and
* doesn't add a prefix (such as "printk."). This is for compatibility
* with __setup(), and it makes sense as truly core parameters aren't
* tied to the particular file they're in.
*/
#define core_param(name, var, type, perm) \
param_check_##type(name, &(var)); \
__module_param_call("", name, param_set_##type, param_get_##type, \
&var, perm)
#endif /* !MODULE */
/* Actually copy string: maxlen param is usually sizeof(string). */
#define module_param_string(name, string, len, perm) \
static const struct kparam_string __param_string_##name \

18
include/linux/workqueue.h
View File

@ -149,11 +149,11 @@ struct execute_work {
extern struct workqueue_struct *
__create_workqueue_key(const char *name, int singlethread,
int freezeable, struct lock_class_key *key,
int freezeable, int rt, struct lock_class_key *key,
const char *lock_name);
#ifdef CONFIG_LOCKDEP
#define __create_workqueue(name, singlethread, freezeable) \
#define __create_workqueue(name, singlethread, freezeable, rt) \
({ \
static struct lock_class_key __key; \
const char *__lock_name; \
@ -164,17 +164,19 @@ __create_workqueue_key(const char *name, int singlethread,
__lock_name = #name; \
\
__create_workqueue_key((name), (singlethread), \
(freezeable), &__key, \
(freezeable), (rt), &__key, \
__lock_name); \
})
#else
#define __create_workqueue(name, singlethread, freezeable) \
__create_workqueue_key((name), (singlethread), (freezeable), NULL, NULL)
#define __create_workqueue(name, singlethread, freezeable, rt) \
__create_workqueue_key((name), (singlethread), (freezeable), (rt), \
NULL, NULL)
#endif
#define create_workqueue(name) __create_workqueue((name), 0, 0)
#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1)
#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)
#define create_workqueue(name) __create_workqueue((name), 0, 0, 0)
#define create_rt_workqueue(name) __create_workqueue((name), 0, 0, 1)
#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1, 0)
#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0, 0)
extern void destroy_workqueue(struct workqueue_struct *wq);

12
init/main.c
View File

@ -699,13 +699,7 @@ asmlinkage void __init start_kernel(void)
}
static int initcall_debug;
static int __init initcall_debug_setup(char *str)
{
initcall_debug = 1;
return 1;
}
__setup("initcall_debug", initcall_debug_setup);
core_param(initcall_debug, initcall_debug, bool, 0644);
int do_one_initcall(initcall_t fn)
{
@ -775,8 +769,6 @@ static void __init do_initcalls(void)
static void __init do_basic_setup(void)
{
rcu_init_sched(); /* needed by module_init stage. */
/* drivers will send hotplug events */
init_workqueues();
usermodehelper_init();
driver_init();
init_irq_proc();
@ -860,6 +852,8 @@ static int __init kernel_init(void * unused)
cad_pid = task_pid(current);
init_workqueues();
smp_prepare_cpus(setup_max_cpus);
do_pre_smp_initcalls();

282
kernel/module.c
View File

@ -42,6 +42,7 @@
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/unwind.h>
#include <linux/rculist.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
#include <linux/license.h>
@ -63,7 +64,7 @@
#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
/* List of modules, protected by module_mutex or preempt_disable
* (add/delete uses stop_machine). */
* (delete uses stop_machine/add uses RCU list operations). */
static DEFINE_MUTEX(module_mutex);
static LIST_HEAD(modules);
@ -132,6 +133,29 @@ static unsigned int find_sec(Elf_Ehdr *hdr,
return 0;
}
/* Find a module section, or NULL. */
static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
const char *secstrings, const char *name)
{
/* Section 0 has sh_addr 0. */
return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
}
/* Find a module section, or NULL. Fill in number of "objects" in section. */
static void *section_objs(Elf_Ehdr *hdr,
Elf_Shdr *sechdrs,
const char *secstrings,
const char *name,
size_t object_size,
unsigned int *num)
{
unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
/* Section 0 has sh_addr 0 and sh_size 0. */
*num = sechdrs[sec].sh_size / object_size;
return (void *)sechdrs[sec].sh_addr;
}
/* Provided by the linker */
extern const struct kernel_symbol __start___ksymtab[];
extern const struct kernel_symbol __stop___ksymtab[];
@ -218,7 +242,7 @@ static bool each_symbol(bool (*fn)(const struct symsearch *arr,
if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
return true;
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
struct symsearch arr[] = {
{ mod->syms, mod->syms + mod->num_syms, mod->crcs,
NOT_GPL_ONLY, false },
@ -1393,17 +1417,6 @@ static void mod_kobject_remove(struct module *mod)
mod_sysfs_fini(mod);
}
/*
* link the module with the whole machine is stopped with interrupts off
* - this defends against kallsyms not taking locks
*/
static int __link_module(void *_mod)
{
struct module *mod = _mod;
list_add(&mod->list, &modules);
return 0;
}
/*
* unlink the module with the whole machine is stopped with interrupts off
* - this defends against kallsyms not taking locks
@ -1789,32 +1802,20 @@ static inline void add_kallsyms(struct module *mod,
}
#endif /* CONFIG_KALLSYMS */
static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
{
#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
static void dynamic_printk_setup(Elf_Shdr *sechdrs, unsigned int verboseindex)
{
struct mod_debug *debug_info;
unsigned long pos, end;
unsigned int num_verbose;
unsigned int i;
pos = sechdrs[verboseindex].sh_addr;
num_verbose = sechdrs[verboseindex].sh_size /
sizeof(struct mod_debug);
end = pos + (num_verbose * sizeof(struct mod_debug));
for (; pos < end; pos += sizeof(struct mod_debug)) {
debug_info = (struct mod_debug *)pos;
register_dynamic_debug_module(debug_info->modname,
debug_info->type, debug_info->logical_modname,
debug_info->flag_names, debug_info->hash,
debug_info->hash2);
for (i = 0; i < num; i++) {
register_dynamic_debug_module(debug[i].modname,
debug[i].type,
debug[i].logical_modname,
debug[i].flag_names,
debug[i].hash, debug[i].hash2);
}
}
#else
static inline void dynamic_printk_setup(Elf_Shdr *sechdrs,
unsigned int verboseindex)
{
}
#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
}
static void *module_alloc_update_bounds(unsigned long size)
{
@ -1843,37 +1844,14 @@ static noinline struct module *load_module(void __user *umod,
unsigned int i;
unsigned int symindex = 0;
unsigned int strindex = 0;
unsigned int setupindex;
unsigned int exindex;
unsigned int exportindex;
unsigned int modindex;
unsigned int obsparmindex;
unsigned int infoindex;
unsigned int gplindex;
unsigned int crcindex;
unsigned int gplcrcindex;
unsigned int versindex;
unsigned int pcpuindex;
unsigned int gplfutureindex;
unsigned int gplfuturecrcindex;
unsigned int modindex, versindex, infoindex, pcpuindex;
unsigned int unwindex = 0;
#ifdef CONFIG_UNUSED_SYMBOLS
unsigned int unusedindex;
unsigned int unusedcrcindex;
unsigned int unusedgplindex;
unsigned int unusedgplcrcindex;
#endif
unsigned int markersindex;
unsigned int markersstringsindex;
unsigned int verboseindex;
unsigned int tracepointsindex;
unsigned int tracepointsstringsindex;
unsigned int mcountindex;
unsigned int num_kp, num_mcount;
struct kernel_param *kp;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
void *mseg;
struct exception_table_entry *extable;
unsigned long *mseg;
mm_segment_t old_fs;
DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
@ -1937,6 +1915,7 @@ static noinline struct module *load_module(void __user *umod,
err = -ENOEXEC;
goto free_hdr;
}
/* This is temporary: point mod into copy of data. */
mod = (void *)sechdrs[modindex].sh_addr;
if (symindex == 0) {
@ -1946,22 +1925,6 @@ static noinline struct module *load_module(void __user *umod,
goto free_hdr;
}
/* Optional sections */
exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
#ifdef CONFIG_UNUSED_SYMBOLS
unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
#endif
setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
@ -2117,42 +2080,57 @@ static noinline struct module *load_module(void __user *umod,
if (err < 0)
goto cleanup;
/* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
mod->syms = (void *)sechdrs[exportindex].sh_addr;
if (crcindex)
mod->crcs = (void *)sechdrs[crcindex].sh_addr;
mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
if (gplcrcindex)
mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
sizeof(*mod->gpl_future_syms);
mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
if (gplfuturecrcindex)
mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
/* Now we've got everything in the final locations, we can
* find optional sections. */
kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp),
&num_kp);
mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
sizeof(*mod->syms), &mod->num_syms);
mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
sizeof(*mod->gpl_syms),
&mod->num_gpl_syms);
mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
"__ksymtab_gpl_future",
sizeof(*mod->gpl_future_syms),
&mod->num_gpl_future_syms);
mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
"__kcrctab_gpl_future");
#ifdef CONFIG_UNUSED_SYMBOLS
mod->num_unused_syms = sechdrs[unusedindex].sh_size /
sizeof(*mod->unused_syms);
mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
sizeof(*mod->unused_gpl_syms);
mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
if (unusedcrcindex)
mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
if (unusedgplcrcindex)
mod->unused_gpl_crcs
= (void *)sechdrs[unusedgplcrcindex].sh_addr;
mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
"__ksymtab_unused",
sizeof(*mod->unused_syms),
&mod->num_unused_syms);
mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
"__kcrctab_unused");
mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
"__ksymtab_unused_gpl",
sizeof(*mod->unused_gpl_syms),
&mod->num_unused_gpl_syms);
mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
"__kcrctab_unused_gpl");
#endif
#ifdef CONFIG_MARKERS
mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
sizeof(*mod->markers), &mod->num_markers);
#endif
#ifdef CONFIG_TRACEPOINTS
mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
"__tracepoints",
sizeof(*mod->tracepoints),
&mod->num_tracepoints);
#endif
#ifdef CONFIG_MODVERSIONS
if ((mod->num_syms && !crcindex)
|| (mod->num_gpl_syms && !gplcrcindex)
|| (mod->num_gpl_future_syms && !gplfuturecrcindex)
if ((mod->num_syms && !mod->crcs)
|| (mod->num_gpl_syms && !mod->gpl_crcs)
|| (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
#ifdef CONFIG_UNUSED_SYMBOLS
|| (mod->num_unused_syms && !unusedcrcindex)
|| (mod->num_unused_gpl_syms && !unusedgplcrcindex)
|| (mod->num_unused_syms && !mod->unused_crcs)
|| (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
#endif
) {
printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
@ -2161,16 +2139,6 @@ static noinline struct module *load_module(void __user *umod,
goto cleanup;
}
#endif
markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
markersstringsindex = find_sec(hdr, sechdrs, secstrings,
"__markers_strings");
verboseindex = find_sec(hdr, sechdrs, secstrings, "__verbose");
tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints");
tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings,
"__tracepoints_strings");
mcountindex = find_sec(hdr, sechdrs, secstrings,
"__mcount_loc");
/* Now do relocations. */
for (i = 1; i < hdr->e_shnum; i++) {
@ -2193,28 +2161,16 @@ static noinline struct module *load_module(void __user *umod,
if (err < 0)
goto cleanup;
}
#ifdef CONFIG_MARKERS
mod->markers = (void *)sechdrs[markersindex].sh_addr;
mod->num_markers =
sechdrs[markersindex].sh_size / sizeof(*mod->markers);
#endif
#ifdef CONFIG_TRACEPOINTS
mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr;
mod->num_tracepoints =
sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints);
#endif
/* Find duplicate symbols */
err = verify_export_symbols(mod);
if (err < 0)
goto cleanup;
/* Set up and sort exception table */
mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
sort_extable(extable, extable + mod->num_exentries);
mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
sizeof(*mod->extable), &mod->num_exentries);
sort_extable(mod->extable, mod->extable + mod->num_exentries);
/* Finally, copy percpu area over. */
percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
@ -2223,11 +2179,17 @@ static noinline struct module *load_module(void __user *umod,
add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
if (!mod->taints) {
struct mod_debug *debug;
unsigned int num_debug;
#ifdef CONFIG_MARKERS
marker_update_probe_range(mod->markers,
mod->markers + mod->num_markers);
#endif
dynamic_printk_setup(sechdrs, verboseindex);
debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
sizeof(*debug), &num_debug);
dynamic_printk_setup(debug, num_debug);
#ifdef CONFIG_TRACEPOINTS
tracepoint_update_probe_range(mod->tracepoints,
mod->tracepoints + mod->num_tracepoints);
@ -2235,8 +2197,9 @@ static noinline struct module *load_module(void __user *umod,
}
/* sechdrs[0].sh_size is always zero */
mseg = (void *)sechdrs[mcountindex].sh_addr;
ftrace_init_module(mseg, mseg + sechdrs[mcountindex].sh_size);
mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
sizeof(*mseg), &num_mcount);
ftrace_init_module(mseg, mseg + num_mcount);
err = module_finalize(hdr, sechdrs, mod);
if (err < 0)
@ -2261,30 +2224,24 @@ static noinline struct module *load_module(void __user *umod,
set_fs(old_fs);
mod->args = args;
if (obsparmindex)
if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
mod->name);
/* Now sew it into the lists so we can get lockdep and oops
* info during argument parsing. Noone should access us, since
* strong_try_module_get() will fail. */
stop_machine(__link_module, mod, NULL);
* info during argument parsing. Noone should access us, since
* strong_try_module_get() will fail.
* lockdep/oops can run asynchronous, so use the RCU list insertion
* function to insert in a way safe to concurrent readers.
* The mutex protects against concurrent writers.
*/
list_add_rcu(&mod->list, &modules);
/* Size of section 0 is 0, so this works well if no params */
err = parse_args(mod->name, mod->args,
(struct kernel_param *)
sechdrs[setupindex].sh_addr,
sechdrs[setupindex].sh_size
/ sizeof(struct kernel_param),
NULL);
err = parse_args(mod->name, mod->args, kp, num_kp, NULL);
if (err < 0)
goto unlink;
err = mod_sysfs_setup(mod,
(struct kernel_param *)
sechdrs[setupindex].sh_addr,
sechdrs[setupindex].sh_size
/ sizeof(struct kernel_param));
err = mod_sysfs_setup(mod, kp, num_kp);
if (err < 0)
goto unlink;
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
@ -2473,7 +2430,7 @@ const char *module_address_lookup(unsigned long addr,
const char *ret = NULL;
preempt_disable();
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
if (within(addr, mod->module_init, mod->init_size)
|| within(addr, mod->module_core, mod->core_size)) {
if (modname)
@ -2496,7 +2453,7 @@ int lookup_module_symbol_name(unsigned long addr, char *symname)
struct module *mod;
preempt_disable();
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
if (within(addr, mod->module_init, mod->init_size) ||
within(addr, mod->module_core, mod->core_size)) {
const char *sym;
@ -2520,7 +2477,7 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
struct module *mod;
preempt_disable();
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
if (within(addr, mod->module_init, mod->init_size) ||
within(addr, mod->module_core, mod->core_size)) {
const char *sym;
@ -2547,7 +2504,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
struct module *mod;
preempt_disable();
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
if (symnum < mod->num_symtab) {
*value = mod->symtab[symnum].st_value;
*type = mod->symtab[symnum].st_info;
@ -2590,7 +2547,7 @@ unsigned long module_kallsyms_lookup_name(const char *name)
ret = mod_find_symname(mod, colon+1);
*colon = ':';
} else {
list_for_each_entry(mod, &modules, list)
list_for_each_entry_rcu(mod, &modules, list)
if ((ret = mod_find_symname(mod, name)) != 0)
break;
}
@ -2693,7 +2650,7 @@ const struct exception_table_entry *search_module_extables(unsigned long addr)
struct module *mod;
preempt_disable();
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->num_exentries == 0)
continue;
@ -2719,7 +2676,7 @@ int is_module_address(unsigned long addr)
preempt_disable();
list_for_each_entry(mod, &modules, list) {
list_for_each_entry_rcu(mod, &modules, list) {
if (within(addr, mod->module_core, mod->core_size)) {
preempt_enable();
return 1;
@ -2740,7 +2697,7 @@ struct module *__module_text_address(unsigned long addr)
if (addr < module_addr_min || addr > module_addr_max)
return NULL;
list_for_each_entry(mod, &modules, list)
list_for_each_entry_rcu(mod, &modules, list)
if (within(addr, mod->module_init, mod->init_text_size)
|| within(addr, mod->module_core, mod->core_text_size))
return mod;
@ -2765,8 +2722,11 @@ void print_modules(void)
char buf[8];
printk("Modules linked in:");
list_for_each_entry(mod, &modules, list)
/* Most callers should already have preempt disabled, but make sure */
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list)
printk(" %s%s", mod->name, module_flags(mod, buf));
preempt_enable();
if (last_unloaded_module[0])
printk(" [last unloaded: %s]", last_unloaded_module);
printk("\n");

17
kernel/panic.c
View File

@ -34,13 +34,6 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
EXPORT_SYMBOL(panic_notifier_list);
static int __init panic_setup(char *str)
{
panic_timeout = simple_strtoul(str, NULL, 0);
return 1;
}
__setup("panic=", panic_setup);
static long no_blink(long time)
{
return 0;
@ -218,13 +211,6 @@ void add_taint(unsigned flag)
}
EXPORT_SYMBOL(add_taint);
static int __init pause_on_oops_setup(char *str)
{
pause_on_oops = simple_strtoul(str, NULL, 0);
return 1;
}
__setup("pause_on_oops=", pause_on_oops_setup);
static void spin_msec(int msecs)
{
int i;
@ -384,3 +370,6 @@ void __stack_chk_fail(void)
}
EXPORT_SYMBOL(__stack_chk_fail);
#endif
core_param(panic, panic_timeout, int, 0644);
core_param(pause_on_oops, pause_on_oops, int, 0644);

272
kernel/params.c
View File

@ -373,6 +373,8 @@ int param_get_string(char *buffer, struct kernel_param *kp)
}
/* sysfs output in /sys/modules/XYZ/parameters/ */
#define to_module_attr(n) container_of(n, struct module_attribute, attr);
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
extern struct kernel_param __start___param[], __stop___param[];
@ -384,6 +386,7 @@ struct param_attribute
struct module_param_attrs
{
unsigned int num;
struct attribute_group grp;
struct param_attribute attrs[0];
};
@ -434,69 +437,84 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
#ifdef CONFIG_SYSFS
/*
* param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
* @mk: struct module_kobject (contains parent kobject)
* @kparam: array of struct kernel_param, the actual parameter definitions
* @num_params: number of entries in array
* @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
* add_sysfs_param - add a parameter to sysfs
* @mk: struct module_kobject
* @kparam: the actual parameter definition to add to sysfs
* @name: name of parameter
*
* Create a kobject for a (per-module) group of parameters, and create files
* in sysfs. A pointer to the param_kobject is returned on success,
* NULL if there's no parameter to export, or other ERR_PTR(err).
* Create a kobject if for a (per-module) parameter if mp NULL, and
* create file in sysfs. Returns an error on out of memory. Always cleans up
* if there's an error.
*/
static __modinit struct module_param_attrs *
param_sysfs_setup(struct module_kobject *mk,
struct kernel_param *kparam,
unsigned int num_params,
unsigned int name_skip)
static __modinit int add_sysfs_param(struct module_kobject *mk,
struct kernel_param *kp,
const char *name)
{
struct module_param_attrs *mp;
unsigned int valid_attrs = 0;
unsigned int i, size[2];
struct param_attribute *pattr;
struct attribute **gattr;
int err;
struct module_param_attrs *new;
struct attribute **attrs;
int err, num;
for (i=0; i<num_params; i++) {
if (kparam[i].perm)
valid_attrs++;
/* We don't bother calling this with invisible parameters. */
BUG_ON(!kp->perm);
if (!mk->mp) {
num = 0;
attrs = NULL;
} else {
num = mk->mp->num;
attrs = mk->mp->grp.attrs;
}
if (!valid_attrs)
return NULL;
size[0] = ALIGN(sizeof(*mp) +
valid_attrs * sizeof(mp->attrs[0]),
sizeof(mp->grp.attrs[0]));
size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
mp = kzalloc(size[0] + size[1], GFP_KERNEL);
if (!mp)
return ERR_PTR(-ENOMEM);
mp->grp.name = "parameters";
mp->grp.attrs = (void *)mp + size[0];
pattr = &mp->attrs[0];
gattr = &mp->grp.attrs[0];
for (i = 0; i < num_params; i++) {
struct kernel_param *kp = &kparam[i];
if (kp->perm) {
pattr->param = kp;
pattr->mattr.show = param_attr_show;
pattr->mattr.store = param_attr_store;
pattr->mattr.attr.name = (char *)&kp->name[name_skip];
pattr->mattr.attr.mode = kp->perm;
*(gattr++) = &(pattr++)->mattr.attr;
}
/* Enlarge. */
new = krealloc(mk->mp,
sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
GFP_KERNEL);
if (!new) {
kfree(mk->mp);
err = -ENOMEM;
goto fail;
}
*gattr = NULL;
if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
kfree(mp);
return ERR_PTR(err);
attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
if (!attrs) {
err = -ENOMEM;
goto fail_free_new;
}
return mp;
/* Sysfs wants everything zeroed. */
memset(new, 0, sizeof(*new));
memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
memset(&attrs[num], 0, sizeof(attrs[num]));
new->grp.name = "parameters";
new->grp.attrs = attrs;
/* Tack new one on the end. */
new->attrs[num].param = kp;
new->attrs[num].mattr.show = param_attr_show;
new->attrs[num].mattr.store = param_attr_store;
new->attrs[num].mattr.attr.name = (char *)name;
new->attrs[num].mattr.attr.mode = kp->perm;
new->num = num+1;
/* Fix up all the pointers, since krealloc can move us */
for (num = 0; num < new->num; num++)
new->grp.attrs[num] = &new->attrs[num].mattr.attr;
new->grp.attrs[num] = NULL;
mk->mp = new;
return 0;
fail_free_new:
kfree(new);
fail:
mk->mp = NULL;
return err;
}
static void free_module_param_attrs(struct module_kobject *mk)
{
kfree(mk->mp->grp.attrs);
kfree(mk->mp);
mk->mp = NULL;
}
#ifdef CONFIG_MODULES
@ -506,21 +524,33 @@ param_sysfs_setup(struct module_kobject *mk,
* @kparam: module parameters (array)
* @num_params: number of module parameters
*
* Adds sysfs entries for module parameters, and creates a link from
* /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
* Adds sysfs entries for module parameters under
* /sys/module/[mod->name]/parameters/
*/
int module_param_sysfs_setup(struct module *mod,
struct kernel_param *kparam,
unsigned int num_params)
{
struct module_param_attrs *mp;
int i, err;
bool params = false;
mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
if (IS_ERR(mp))
return PTR_ERR(mp);
for (i = 0; i < num_params; i++) {
if (kparam[i].perm == 0)
continue;
err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
if (err)
return err;
params = true;
}
mod->param_attrs = mp;
return 0;
if (!params)
return 0;
/* Create the param group. */
err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
if (err)
free_module_param_attrs(&mod->mkobj);
return err;
}
/*
@ -532,43 +562,55 @@ int module_param_sysfs_setup(struct module *mod,
*/
void module_param_sysfs_remove(struct module *mod)
{
if (mod->param_attrs) {
sysfs_remove_group(&mod->mkobj.kobj,
&mod->param_attrs->grp);
if (mod->mkobj.mp) {
sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
/* We are positive that no one is using any param
* attrs at this point. Deallocate immediately. */
kfree(mod->param_attrs);
mod->param_attrs = NULL;
free_module_param_attrs(&mod->mkobj);
}
}
#endif
/*
* kernel_param_sysfs_setup - wrapper for built-in params support
*/
static void __init kernel_param_sysfs_setup(const char *name,
struct kernel_param *kparam,
unsigned int num_params,
unsigned int name_skip)
static void __init kernel_add_sysfs_param(const char *name,
struct kernel_param *kparam,
unsigned int name_skip)
{
struct module_kobject *mk;
int ret;
struct kobject *kobj;
int err;
mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
BUG_ON(!mk);
kobj = kset_find_obj(module_kset, name);
if (kobj) {
/* We already have one. Remove params so we can add more. */
mk = to_module_kobject(kobj);
/* We need to remove it before adding parameters. */
sysfs_remove_group(&mk->kobj, &mk->mp->grp);
} else {
mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
BUG_ON(!mk);
mk->mod = THIS_MODULE;
mk->kobj.kset = module_kset;
ret = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, "%s", name);
if (ret) {
kobject_put(&mk->kobj);
printk(KERN_ERR "Module '%s' failed to be added to sysfs, "
"error number %d\n", name, ret);
printk(KERN_ERR "The system will be unstable now.\n");
return;
mk->mod = THIS_MODULE;
mk->kobj.kset = module_kset;
err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
"%s", name);
if (err) {
kobject_put(&mk->kobj);
printk(KERN_ERR "Module '%s' failed add to sysfs, "
"error number %d\n", name, err);
printk(KERN_ERR "The system will be unstable now.\n");
return;
}
/* So that exit path is even. */
kobject_get(&mk->kobj);
}
param_sysfs_setup(mk, kparam, num_params, name_skip);
/* These should not fail at boot. */
err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
BUG_ON(err);
err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
BUG_ON(err);
kobject_uevent(&mk->kobj, KOBJ_ADD);
kobject_put(&mk->kobj);
}
/*
@ -579,60 +621,36 @@ static void __init kernel_param_sysfs_setup(const char *name,
* The "module" name (KBUILD_MODNAME) is stored before a dot, the
* "parameter" name is stored behind a dot in kernel_param->name. So,
* extract the "module" name for all built-in kernel_param-eters,
* and for all who have the same, call kernel_param_sysfs_setup.
* and for all who have the same, call kernel_add_sysfs_param.
*/
static void __init param_sysfs_builtin(void)
{
struct kernel_param *kp, *kp_begin = NULL;
unsigned int i, name_len, count = 0;
char modname[MODULE_NAME_LEN + 1] = "";
struct kernel_param *kp;
unsigned int name_len;
char modname[MODULE_NAME_LEN];
for (i=0; i < __stop___param - __start___param; i++) {
for (kp = __start___param; kp < __stop___param; kp++) {
char *dot;
size_t max_name_len;
kp = &__start___param[i];
max_name_len =
min_t(size_t, MODULE_NAME_LEN, strlen(kp->name));
dot = memchr(kp->name, '.', max_name_len);
if (!dot) {
DEBUGP("couldn't find period in first %d characters "
"of %s\n", MODULE_NAME_LEN, kp->name);
if (kp->perm == 0)
continue;
}
name_len = dot - kp->name;
/* new kbuild_modname? */
if (strlen(modname) != name_len
|| strncmp(modname, kp->name, name_len) != 0) {
/* add a new kobject for previous kernel_params. */
if (count)
kernel_param_sysfs_setup(modname,
kp_begin,
count,
strlen(modname)+1);
strncpy(modname, kp->name, name_len);
modname[name_len] = '\0';
count = 0;
kp_begin = kp;
dot = strchr(kp->name, '.');
if (!dot) {
/* This happens for core_param() */
strcpy(modname, "kernel");
name_len = 0;
} else {
name_len = dot - kp->name + 1;
strlcpy(modname, kp->name, name_len);
}
count++;
kernel_add_sysfs_param(modname, kp, name_len);
}
/* last kernel_params need to be registered as well */
if (count)
kernel_param_sysfs_setup(modname, kp_begin, count,
strlen(modname)+1);
}
/* module-related sysfs stuff */
#define to_module_attr(n) container_of(n, struct module_attribute, attr);
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
static ssize_t module_attr_show(struct kobject *kobj,
struct attribute *attr,
char *buf)

118
kernel/stop_machine.c
View File

@ -37,9 +37,13 @@ struct stop_machine_data {
/* Like num_online_cpus(), but hotplug cpu uses us, so we need this. */
static unsigned int num_threads;
static atomic_t thread_ack;
static struct completion finished;
static DEFINE_MUTEX(lock);
static struct workqueue_struct *stop_machine_wq;
static struct stop_machine_data active, idle;
static const cpumask_t *active_cpus;
static void *stop_machine_work;
static void set_state(enum stopmachine_state newstate)
{
/* Reset ack counter. */
@ -51,21 +55,26 @@ static void set_state(enum stopmachine_state newstate)
/* Last one to ack a state moves to the next state. */
static void ack_state(void)
{
if (atomic_dec_and_test(&thread_ack)) {
/* If we're the last one to ack the EXIT, we're finished. */
if (state == STOPMACHINE_EXIT)
complete(&finished);
else
set_state(state + 1);
}
if (atomic_dec_and_test(&thread_ack))
set_state(state + 1);
}
/* This is the actual thread which stops the CPU. It exits by itself rather
* than waiting for kthread_stop(), because it's easier for hotplug CPU. */
static int stop_cpu(struct stop_machine_data *smdata)
/* This is the actual function which stops the CPU. It runs
* in the context of a dedicated stopmachine workqueue. */
static void stop_cpu(struct work_struct *unused)
{
enum stopmachine_state curstate = STOPMACHINE_NONE;
struct stop_machine_data *smdata = &idle;
int cpu = smp_processor_id();
int err;
if (!active_cpus) {
if (cpu == first_cpu(cpu_online_map))
smdata = &active;
} else {
if (cpu_isset(cpu, *active_cpus))
smdata = &active;
}
/* Simple state machine */
do {
/* Chill out and ensure we re-read stopmachine_state. */
@ -78,9 +87,11 @@ static int stop_cpu(struct stop_machine_data *smdata)
hard_irq_disable();
break;
case STOPMACHINE_RUN:
/* |= allows error detection if functions on
* multiple CPUs. */
smdata->fnret |= smdata->fn(smdata->data);
/* On multiple CPUs only a single error code
* is needed to tell that something failed. */
err = smdata->fn(smdata->data);
if (err)
smdata->fnret = err;
break;
default:
break;
@ -90,7 +101,6 @@ static int stop_cpu(struct stop_machine_data *smdata)
} while (curstate != STOPMACHINE_EXIT);
local_irq_enable();
do_exit(0);
}
/* Callback for CPUs which aren't supposed to do anything. */
@ -101,78 +111,34 @@ static int chill(void *unused)
int __stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
{
int i, err;
struct stop_machine_data active, idle;
struct task_struct **threads;
struct work_struct *sm_work;
int i;
/* Set up initial state. */
mutex_lock(&lock);
num_threads = num_online_cpus();
active_cpus = cpus;
active.fn = fn;
active.data = data;
active.fnret = 0;
idle.fn = chill;
idle.data = NULL;
/* This could be too big for stack on large machines. */
threads = kcalloc(NR_CPUS, sizeof(threads[0]), GFP_KERNEL);
if (!threads)
return -ENOMEM;
/* Set up initial state. */
mutex_lock(&lock);
init_completion(&finished);
num_threads = num_online_cpus();
set_state(STOPMACHINE_PREPARE);
for_each_online_cpu(i) {
struct stop_machine_data *smdata = &idle;
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
if (!cpus) {
if (i == first_cpu(cpu_online_map))
smdata = &active;
} else {
if (cpu_isset(i, *cpus))
smdata = &active;
}
threads[i] = kthread_create((void *)stop_cpu, smdata, "kstop%u",
i);
if (IS_ERR(threads[i])) {
err = PTR_ERR(threads[i]);
threads[i] = NULL;
goto kill_threads;
}
/* Place it onto correct cpu. */
kthread_bind(threads[i], i);
/* Make it highest prio. */
if (sched_setscheduler_nocheck(threads[i], SCHED_FIFO, &param))
BUG();
}
/* We've created all the threads. Wake them all: hold this CPU so one
/* Schedule the stop_cpu work on all cpus: hold this CPU so one
* doesn't hit this CPU until we're ready. */
get_cpu();
for_each_online_cpu(i)
wake_up_process(threads[i]);
for_each_online_cpu(i) {
sm_work = percpu_ptr(stop_machine_work, i);
INIT_WORK(sm_work, stop_cpu);
queue_work_on(i, stop_machine_wq, sm_work);
}
/* This will release the thread on our CPU. */
put_cpu();
wait_for_completion(&finished);
flush_workqueue(stop_machine_wq);
mutex_unlock(&lock);
kfree(threads);
return active.fnret;
kill_threads:
for_each_online_cpu(i)
if (threads[i])
kthread_stop(threads[i]);
mutex_unlock(&lock);
kfree(threads);
return err;
}
int stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
@ -187,3 +153,11 @@ int stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
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;
}
early_initcall(stop_machine_init);

7
kernel/workqueue.c
View File

@ -62,6 +62,7 @@ struct workqueue_struct {
const char *name;
int singlethread;
int freezeable; /* Freeze threads during suspend */
int rt;
#ifdef CONFIG_LOCKDEP
struct lockdep_map lockdep_map;
#endif
@ -766,6 +767,7 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
struct workqueue_struct *wq = cwq->wq;
const char *fmt = is_single_threaded(wq) ? "%s" : "%s/%d";
struct task_struct *p;
@ -781,7 +783,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
*/
if (IS_ERR(p))
return PTR_ERR(p);
if (cwq->wq->rt)
sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
cwq->thread = p;
return 0;
@ -801,6 +804,7 @@ static void start_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
struct workqueue_struct *__create_workqueue_key(const char *name,
int singlethread,
int freezeable,
int rt,
struct lock_class_key *key,
const char *lock_name)
{
@ -822,6 +826,7 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
wq->singlethread = singlethread;
wq->freezeable = freezeable;
wq->rt = rt;
INIT_LIST_HEAD(&wq->list);
if (singlethread) {