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Merge commit 'v2.6.38-rc5' into sched/core

Browse Source 
Merge reason: Pick up upstream fixes.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2011-02-16 13:31:51 +01:00
parent d95f412200 85e2efbb1d
commit 48fa4b8ecf
917 changed files with 12190 additions and 6180 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/capability.c
View File

@@ -306,7 +306,7 @@ int capable(int cap)
BUG();
}
if (security_capable(cap) == 0) {
if (security_capable(current_cred(), cap) == 0) {
current->flags |= PF_SUPERPRIV;
return 1;
}

16
kernel/cred.c
View File

@@ -252,13 +252,13 @@ struct cred *cred_alloc_blank(void)
#endif
atomic_set(&new->usage, 1);
#ifdef CONFIG_DEBUG_CREDENTIALS
new->magic = CRED_MAGIC;
#endif
if (security_cred_alloc_blank(new, GFP_KERNEL) < 0)
goto error;
#ifdef CONFIG_DEBUG_CREDENTIALS
new->magic = CRED_MAGIC;
#endif
return new;
error:
@@ -657,6 +657,8 @@ struct cred *prepare_kernel_cred(struct task_struct *daemon)
validate_creds(old);
*new = *old;
atomic_set(&new->usage, 1);
set_cred_subscribers(new, 0);
get_uid(new->user);
get_group_info(new->group_info);
@@ -674,8 +676,6 @@ struct cred *prepare_kernel_cred(struct task_struct *daemon)
if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
goto error;
atomic_set(&new->usage, 1);
set_cred_subscribers(new, 0);
put_cred(old);
validate_creds(new);
return new;
@@ -748,7 +748,11 @@ bool creds_are_invalid(const struct cred *cred)
if (cred->magic != CRED_MAGIC)
return true;
#ifdef CONFIG_SECURITY_SELINUX
if (selinux_is_enabled()) {
/*
* cred->security == NULL if security_cred_alloc_blank() or
* security_prepare_creds() returned an error.
*/
if (selinux_is_enabled() && cred->security) {
if ((unsigned long) cred->security < PAGE_SIZE)
return true;
if ((*(u32 *)cred->security & 0xffffff00) ==

14
kernel/irq/migration.c
View File

@@ -56,6 +56,7 @@ void move_masked_irq(int irq)
void move_native_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
bool masked;
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
@@ -63,8 +64,15 @@ void move_native_irq(int irq)
if (unlikely(desc->status & IRQ_DISABLED))
return;
desc->irq_data.chip->irq_mask(&desc->irq_data);
/*
* Be careful vs. already masked interrupts. If this is a
* threaded interrupt with ONESHOT set, we can end up with an
* interrupt storm.
*/
masked = desc->status & IRQ_MASKED;
if (!masked)
desc->irq_data.chip->irq_mask(&desc->irq_data);
move_masked_irq(irq);
desc->irq_data.chip->irq_unmask(&desc->irq_data);
if (!masked)
desc->irq_data.chip->irq_unmask(&desc->irq_data);
}

16
kernel/module.c
View File

@@ -2460,9 +2460,9 @@ static void find_module_sections(struct module *mod, struct load_info *info)
#endif
#ifdef CONFIG_TRACEPOINTS
mod->tracepoints = section_objs(info, "__tracepoints",
sizeof(*mod->tracepoints),
&mod->num_tracepoints);
mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
sizeof(*mod->tracepoints_ptrs),
&mod->num_tracepoints);
#endif
#ifdef HAVE_JUMP_LABEL
mod->jump_entries = section_objs(info, "__jump_table",
@@ -3393,7 +3393,7 @@ void module_layout(struct module *mod,
struct modversion_info *ver,
struct kernel_param *kp,
struct kernel_symbol *ks,
struct tracepoint *tp)
struct tracepoint * const *tp)
{
}
EXPORT_SYMBOL(module_layout);
@@ -3407,8 +3407,8 @@ void module_update_tracepoints(void)
mutex_lock(&module_mutex);
list_for_each_entry(mod, &modules, list)
if (!mod->taints)
tracepoint_update_probe_range(mod->tracepoints,
mod->tracepoints + mod->num_tracepoints);
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
mutex_unlock(&module_mutex);
}
@@ -3432,8 +3432,8 @@ int module_get_iter_tracepoints(struct tracepoint_iter *iter)
else if (iter_mod > iter->module)
iter->tracepoint = NULL;
found = tracepoint_get_iter_range(&iter->tracepoint,
iter_mod->tracepoints,
iter_mod->tracepoints
iter_mod->tracepoints_ptrs,
iter_mod->tracepoints_ptrs
+ iter_mod->num_tracepoints);
if (found) {
iter->module = iter_mod;

10
kernel/perf_event.c
View File

@@ -1901,11 +1901,12 @@ static void __perf_event_read(void *info)
return;
raw_spin_lock(&ctx->lock);
update_context_time(ctx);
if (ctx->is_active)
update_context_time(ctx);
update_event_times(event);
if (event->state == PERF_EVENT_STATE_ACTIVE)
event->pmu->read(event);
raw_spin_unlock(&ctx->lock);
event->pmu->read(event);
}
static inline u64 perf_event_count(struct perf_event *event)
@@ -1999,8 +2000,7 @@ static int alloc_callchain_buffers(void)
* accessed from NMI. Use a temporary manual per cpu allocation
* until that gets sorted out.
*/
size = sizeof(*entries) + sizeof(struct perf_callchain_entry *) *
num_possible_cpus();
size = offsetof(struct callchain_cpus_entries, cpu_entries[nr_cpu_ids]);
entries = kzalloc(size, GFP_KERNEL);
if (!entries)

154
kernel/printk.c
View File

@@ -97,7 +97,7 @@ static int console_locked, console_suspended;
/*
* logbuf_lock protects log_buf, log_start, log_end, con_start and logged_chars
* It is also used in interesting ways to provide interlocking in
* release_console_sem().
* console_unlock();.
*/
static DEFINE_SPINLOCK(logbuf_lock);
@@ -262,25 +262,47 @@ int dmesg_restrict = 1;
int dmesg_restrict;
#endif
static int syslog_action_restricted(int type)
{
if (dmesg_restrict)
return 1;
/* Unless restricted, we allow "read all" and "get buffer size" for everybody */
return type != SYSLOG_ACTION_READ_ALL && type != SYSLOG_ACTION_SIZE_BUFFER;
}
static int check_syslog_permissions(int type, bool from_file)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've
* already done the capabilities checks at open time.
*/
if (from_file && type != SYSLOG_ACTION_OPEN)
return 0;
if (syslog_action_restricted(type)) {
if (capable(CAP_SYSLOG))
return 0;
/* For historical reasons, accept CAP_SYS_ADMIN too, with a warning */
if (capable(CAP_SYS_ADMIN)) {
WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
"but no CAP_SYSLOG (deprecated).\n");
return 0;
}
return -EPERM;
}
return 0;
}
int do_syslog(int type, char __user *buf, int len, bool from_file)
{
unsigned i, j, limit, count;
int do_clear = 0;
char c;
int error = 0;
int error;
/*
* If this is from /proc/kmsg we only do the capabilities checks
* at open time.
*/
if (type == SYSLOG_ACTION_OPEN || !from_file) {
if (dmesg_restrict && !capable(CAP_SYSLOG))
goto warn; /* switch to return -EPERM after 2.6.39 */
if ((type != SYSLOG_ACTION_READ_ALL &&
type != SYSLOG_ACTION_SIZE_BUFFER) &&
!capable(CAP_SYSLOG))
goto warn; /* switch to return -EPERM after 2.6.39 */
}
error = check_syslog_permissions(type, from_file);
if (error)
goto out;
error = security_syslog(type);
if (error)
@@ -423,12 +445,6 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
}
out:
return error;
warn:
/* remove after 2.6.39 */
if (capable(CAP_SYS_ADMIN))
WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
"but no CAP_SYSLOG (deprecated and denied).\n");
return -EPERM;
}
SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
@@ -501,7 +517,7 @@ static void _call_console_drivers(unsigned start,
/*
* Call the console drivers, asking them to write out
* log_buf[start] to log_buf[end - 1].
* The console_sem must be held.
* The console_lock must be held.
*/
static void call_console_drivers(unsigned start, unsigned end)
{
@@ -604,11 +620,11 @@ static int have_callable_console(void)
*
* This is printk(). It can be called from any context. We want it to work.
*
* We try to grab the console_sem. If we succeed, it's easy - we log the output and
* We try to grab the console_lock. If we succeed, it's easy - we log the output and
* call the console drivers. If we fail to get the semaphore we place the output
* into the log buffer and return. The current holder of the console_sem will
* notice the new output in release_console_sem() and will send it to the
* consoles before releasing the semaphore.
* notice the new output in console_unlock(); and will send it to the
* consoles before releasing the lock.
*
* One effect of this deferred printing is that code which calls printk() and
* then changes console_loglevel may break. This is because console_loglevel
@@ -659,19 +675,19 @@ static inline int can_use_console(unsigned int cpu)
/*
* Try to get console ownership to actually show the kernel
* messages from a 'printk'. Return true (and with the
* console_semaphore held, and 'console_locked' set) if it
* console_lock held, and 'console_locked' set) if it
* is successful, false otherwise.
*
* This gets called with the 'logbuf_lock' spinlock held and
* interrupts disabled. It should return with 'lockbuf_lock'
* released but interrupts still disabled.
*/
static int acquire_console_semaphore_for_printk(unsigned int cpu)
static int console_trylock_for_printk(unsigned int cpu)
__releases(&logbuf_lock)
{
int retval = 0;
if (!try_acquire_console_sem()) {
if (console_trylock()) {
retval = 1;
/*
@@ -827,12 +843,12 @@ asmlinkage int vprintk(const char *fmt, va_list args)
* actual magic (print out buffers, wake up klogd,
* etc).
*
* The acquire_console_semaphore_for_printk() function
* The console_trylock_for_printk() function
* will release 'logbuf_lock' regardless of whether it
* actually gets the semaphore or not.
*/
if (acquire_console_semaphore_for_printk(this_cpu))
release_console_sem();
if (console_trylock_for_printk(this_cpu))
console_unlock();
lockdep_on();
out_restore_irqs:
@@ -993,7 +1009,7 @@ void suspend_console(void)
if (!console_suspend_enabled)
return;
printk("Suspending console(s) (use no_console_suspend to debug)\n");
acquire_console_sem();
console_lock();
console_suspended = 1;
up(&console_sem);
}
@@ -1004,7 +1020,7 @@ void resume_console(void)
return;
down(&console_sem);
console_suspended = 0;
release_console_sem();
console_unlock();
}
/**
@@ -1027,21 +1043,21 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self,
case CPU_DYING:
case CPU_DOWN_FAILED:
case CPU_UP_CANCELED:
acquire_console_sem();
release_console_sem();
console_lock();
console_unlock();
}
return NOTIFY_OK;
}
/**
* acquire_console_sem - lock the console system for exclusive use.
* console_lock - lock the console system for exclusive use.
*
* Acquires a semaphore which guarantees that the caller has
* Acquires a lock which guarantees that the caller has
* exclusive access to the console system and the console_drivers list.
*
* Can sleep, returns nothing.
*/
void acquire_console_sem(void)
void console_lock(void)
{
BUG_ON(in_interrupt());
down(&console_sem);
@@ -1050,21 +1066,29 @@ void acquire_console_sem(void)
console_locked = 1;
console_may_schedule = 1;
}
EXPORT_SYMBOL(acquire_console_sem);
EXPORT_SYMBOL(console_lock);
int try_acquire_console_sem(void)
/**
* console_trylock - try to lock the console system for exclusive use.
*
* Tried to acquire a lock which guarantees that the caller has
* exclusive access to the console system and the console_drivers list.
*
* returns 1 on success, and 0 on failure to acquire the lock.
*/
int console_trylock(void)
{
if (down_trylock(&console_sem))
return -1;
return 0;
if (console_suspended) {
up(&console_sem);
return -1;
return 0;
}
console_locked = 1;
console_may_schedule = 0;
return 0;
return 1;
}
EXPORT_SYMBOL(try_acquire_console_sem);
EXPORT_SYMBOL(console_trylock);
int is_console_locked(void)
{
@@ -1095,20 +1119,20 @@ void wake_up_klogd(void)
}
/**
* release_console_sem - unlock the console system
* console_unlock - unlock the console system
*
* Releases the semaphore which the caller holds on the console system
* Releases the console_lock which the caller holds on the console system
* and the console driver list.
*
* While the semaphore was held, console output may have been buffered
* by printk(). If this is the case, release_console_sem() emits
* the output prior to releasing the semaphore.
* While the console_lock was held, console output may have been buffered
* by printk(). If this is the case, console_unlock(); emits
* the output prior to releasing the lock.
*
* If there is output waiting for klogd, we wake it up.
*
* release_console_sem() may be called from any context.
* console_unlock(); may be called from any context.
*/
void release_console_sem(void)
void console_unlock(void)
{
unsigned long flags;
unsigned _con_start, _log_end;
@@ -1141,7 +1165,7 @@ void release_console_sem(void)
if (wake_klogd)
wake_up_klogd();
}
EXPORT_SYMBOL(release_console_sem);
EXPORT_SYMBOL(console_unlock);
/**
* console_conditional_schedule - yield the CPU if required
@@ -1150,7 +1174,7 @@ EXPORT_SYMBOL(release_console_sem);
* if this CPU should yield the CPU to another task, do
* so here.
*
* Must be called within acquire_console_sem().
* Must be called within console_lock();.
*/
void __sched console_conditional_schedule(void)
{
@@ -1171,14 +1195,14 @@ void console_unblank(void)
if (down_trylock(&console_sem) != 0)
return;
} else
acquire_console_sem();
console_lock();
console_locked = 1;
console_may_schedule = 0;
for_each_console(c)
if ((c->flags & CON_ENABLED) && c->unblank)
c->unblank();
release_console_sem();
console_unlock();
}
/*
@@ -1189,7 +1213,7 @@ struct tty_driver *console_device(int *index)
struct console *c;
struct tty_driver *driver = NULL;
acquire_console_sem();
console_lock();
for_each_console(c) {
if (!c->device)
continue;
@@ -1197,7 +1221,7 @@ struct tty_driver *console_device(int *index)
if (driver)
break;
}
release_console_sem();
console_unlock();
return driver;
}
@@ -1208,17 +1232,17 @@ struct tty_driver *console_device(int *index)
*/
void console_stop(struct console *console)
{
acquire_console_sem();
console_lock();
console->flags &= ~CON_ENABLED;
release_console_sem();
console_unlock();
}
EXPORT_SYMBOL(console_stop);
void console_start(struct console *console)
{
acquire_console_sem();
console_lock();
console->flags |= CON_ENABLED;
release_console_sem();
console_unlock();
}
EXPORT_SYMBOL(console_start);
@@ -1340,7 +1364,7 @@ void register_console(struct console *newcon)
* Put this console in the list - keep the
* preferred driver at the head of the list.
*/
acquire_console_sem();
console_lock();
if ((newcon->flags & CON_CONSDEV) || console_drivers == NULL) {
newcon->next = console_drivers;
console_drivers = newcon;
@@ -1352,14 +1376,14 @@ void register_console(struct console *newcon)
}
if (newcon->flags & CON_PRINTBUFFER) {
/*
* release_console_sem() will print out the buffered messages
* console_unlock(); will print out the buffered messages
* for us.
*/
spin_lock_irqsave(&logbuf_lock, flags);
con_start = log_start;
spin_unlock_irqrestore(&logbuf_lock, flags);
}
release_console_sem();
console_unlock();
console_sysfs_notify();
/*
@@ -1396,7 +1420,7 @@ int unregister_console(struct console *console)
return braille_unregister_console(console);
#endif
acquire_console_sem();
console_lock();
if (console_drivers == console) {
console_drivers=console->next;
res = 0;
@@ -1418,7 +1442,7 @@ int unregister_console(struct console *console)
if (console_drivers != NULL && console->flags & CON_CONSDEV)
console_drivers->flags |= CON_CONSDEV;
release_console_sem();
console_unlock();
console_sysfs_notify();
return res;
}

2
kernel/ptrace.c
View File

@@ -313,7 +313,7 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
child->exit_code = data;
dead = __ptrace_detach(current, child);
if (!child->exit_state)
wake_up_process(child);
wake_up_state(child, TASK_TRACED | TASK_STOPPED);
}
write_unlock_irq(&tasklist_lock);

2
kernel/sched_rt.c
View File

@@ -625,7 +625,7 @@ static void update_curr_rt(struct rq *rq)
struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
u64 delta_exec;
if (!task_has_rt_policy(curr))
if (curr->sched_class != &rt_sched_class)
return;
delta_exec = rq->clock_task - curr->se.exec_start;

3
kernel/sys.c
View File

@@ -1385,7 +1385,8 @@ static int check_prlimit_permission(struct task_struct *task)
const struct cred *cred = current_cred(), *tcred;
tcred = __task_cred(task);
if ((cred->uid != tcred->euid ||
if (current != task &&
(cred->uid != tcred->euid ||
cred->uid != tcred->suid ||
cred->uid != tcred->uid ||
cred->gid != tcred->egid ||

3
kernel/sysctl.c
View File

@@ -170,7 +170,8 @@ static int proc_taint(struct ctl_table *table, int write,
#endif
#ifdef CONFIG_MAGIC_SYSRQ
static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
/* Note: sysrq code uses it's own private copy */
static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
static int sysrq_sysctl_handler(ctl_table *table, int write,
void __user *buffer, size_t *lenp,

4
kernel/time/timer_list.c
View File

@@ -41,7 +41,7 @@ static void print_name_offset(struct seq_file *m, void *sym)
char symname[KSYM_NAME_LEN];
if (lookup_symbol_name((unsigned long)sym, symname) < 0)
SEQ_printf(m, "<%p>", sym);
SEQ_printf(m, "<%pK>", sym);
else
SEQ_printf(m, "%s", symname);
}
@@ -112,7 +112,7 @@ next_one:
static void
print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
{
SEQ_printf(m, " .base: %p\n", base);
SEQ_printf(m, " .base: %pK\n", base);
SEQ_printf(m, " .index: %d\n",
base->index);
SEQ_printf(m, " .resolution: %Lu nsecs\n",

8
kernel/timer.c
View File

@@ -959,7 +959,7 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
*
* Synchronization rules: Callers must prevent restarting of the timer,
* otherwise this function is meaningless. It must not be called from
* hardirq contexts. The caller must not hold locks which would prevent
* interrupt contexts. The caller must not hold locks which would prevent
* completion of the timer's handler. The timer's handler must not call
* add_timer_on(). Upon exit the timer is not queued and the handler is
* not running on any CPU.
@@ -969,10 +969,12 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
int del_timer_sync(struct timer_list *timer)
{
#ifdef CONFIG_LOCKDEP
local_bh_disable();
unsigned long flags;
local_irq_save(flags);
lock_map_acquire(&timer->lockdep_map);
lock_map_release(&timer->lockdep_map);
local_bh_enable();
local_irq_restore(flags);
#endif
/*
* don't use it in hardirq context, because it

7
kernel/trace/blktrace.c
View File

@@ -138,6 +138,13 @@ void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
!blk_tracer_enabled))
return;
/*
* If the BLK_TC_NOTIFY action mask isn't set, don't send any note
* message to the trace.
*/
if (!(bt->act_mask & BLK_TC_NOTIFY))
return;
local_irq_save(flags);
buf = per_cpu_ptr(bt->msg_data, smp_processor_id());
va_start(args, fmt);

12
kernel/trace/trace_events.c
View File

@@ -1284,7 +1284,7 @@ trace_create_file_ops(struct module *mod)
static void trace_module_add_events(struct module *mod)
{
struct ftrace_module_file_ops *file_ops = NULL;
struct ftrace_event_call *call, *start, *end;
struct ftrace_event_call **call, **start, **end;
start = mod->trace_events;
end = mod->trace_events + mod->num_trace_events;
@@ -1297,7 +1297,7 @@ static void trace_module_add_events(struct module *mod)
return;
for_each_event(call, start, end) {
__trace_add_event_call(call, mod,
__trace_add_event_call(*call, mod,
&file_ops->id, &file_ops->enable,
&file_ops->filter, &file_ops->format);
}
@@ -1367,8 +1367,8 @@ static struct notifier_block trace_module_nb = {
.priority = 0,
};
extern struct ftrace_event_call __start_ftrace_events[];
extern struct ftrace_event_call __stop_ftrace_events[];
extern struct ftrace_event_call *__start_ftrace_events[];
extern struct ftrace_event_call *__stop_ftrace_events[];
static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
@@ -1384,7 +1384,7 @@ __setup("trace_event=", setup_trace_event);
static __init int event_trace_init(void)
{
struct ftrace_event_call *call;
struct ftrace_event_call **call;
struct dentry *d_tracer;
struct dentry *entry;
struct dentry *d_events;
@@ -1430,7 +1430,7 @@ static __init int event_trace_init(void)
pr_warning("tracing: Failed to allocate common fields");
for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
__trace_add_event_call(call, NULL, &ftrace_event_id_fops,
__trace_add_event_call(*call, NULL, &ftrace_event_id_fops,
&ftrace_enable_fops,
&ftrace_event_filter_fops,
&ftrace_event_format_fops);

6
kernel/trace/trace_export.c
View File

@@ -161,13 +161,13 @@ struct ftrace_event_class event_class_ftrace_##call = { \
.fields = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
}; \
\
struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
struct ftrace_event_call __used event_##call = { \
.name = #call, \
.event.type = etype, \
.class = &event_class_ftrace_##call, \
.print_fmt = print, \
}; \
struct ftrace_event_call __used \
__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;
#include "trace_entries.h"

19
kernel/trace/trace_syscalls.c
View File

@@ -55,20 +55,21 @@ struct ftrace_event_class event_class_syscall_exit = {
.raw_init = init_syscall_trace,
};
extern unsigned long __start_syscalls_metadata[];
extern unsigned long __stop_syscalls_metadata[];
extern struct syscall_metadata *__start_syscalls_metadata[];
extern struct syscall_metadata *__stop_syscalls_metadata[];
static struct syscall_metadata **syscalls_metadata;
static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
static __init struct syscall_metadata *
find_syscall_meta(unsigned long syscall)
{
struct syscall_metadata *start;
struct syscall_metadata *stop;
struct syscall_metadata **start;
struct syscall_metadata **stop;
char str[KSYM_SYMBOL_LEN];
start = (struct syscall_metadata *)__start_syscalls_metadata;
stop = (struct syscall_metadata *)__stop_syscalls_metadata;
start = __start_syscalls_metadata;
stop = __stop_syscalls_metadata;
kallsyms_lookup(syscall, NULL, NULL, NULL, str);
for ( ; start < stop; start++) {
@@ -78,8 +79,8 @@ static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
* with "SyS" instead of "sys", leading to an unwanted
* mismatch.
*/
if (start->name && !strcmp(start->name + 3, str + 3))
return start;
if ((*start)->name && !strcmp((*start)->name + 3, str + 3))
return *start;
}
return NULL;
}

31
kernel/tracepoint.c
View File

@@ -27,8 +27,8 @@
#include <linux/sched.h>
#include <linux/jump_label.h>
extern struct tracepoint __start___tracepoints[];
extern struct tracepoint __stop___tracepoints[];
extern struct tracepoint * const __start___tracepoints_ptrs[];
extern struct tracepoint * const __stop___tracepoints_ptrs[];
/* Set to 1 to enable tracepoint debug output */
static const int tracepoint_debug;
@@ -298,10 +298,10 @@ static void disable_tracepoint(struct tracepoint *elem)
*
* Updates the probe callback corresponding to a range of tracepoints.
*/
void
tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
void tracepoint_update_probe_range(struct tracepoint * const *begin,
struct tracepoint * const *end)
{
struct tracepoint *iter;
struct tracepoint * const *iter;
struct tracepoint_entry *mark_entry;
if (!begin)
@@ -309,12 +309,12 @@ tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
mutex_lock(&tracepoints_mutex);
for (iter = begin; iter < end; iter++) {
mark_entry = get_tracepoint(iter->name);
mark_entry = get_tracepoint((*iter)->name);
if (mark_entry) {
set_tracepoint(&mark_entry, iter,
set_tracepoint(&mark_entry, *iter,
!!mark_entry->refcount);
} else {
disable_tracepoint(iter);
disable_tracepoint(*iter);
}
}
mutex_unlock(&tracepoints_mutex);
@@ -326,8 +326,8 @@ tracepoint_update_probe_range(struct tracepoint *begin, struct tracepoint *end)
static void tracepoint_update_probes(void)
{
/* Core kernel tracepoints */
tracepoint_update_probe_range(__start___tracepoints,
__stop___tracepoints);
tracepoint_update_probe_range(__start___tracepoints_ptrs,
__stop___tracepoints_ptrs);
/* tracepoints in modules. */
module_update_tracepoints();
}
@@ -514,8 +514,8 @@ EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
* Will return the first tracepoint in the range if the input tracepoint is
* NULL.
*/
int tracepoint_get_iter_range(struct tracepoint **tracepoint,
struct tracepoint *begin, struct tracepoint *end)
int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
struct tracepoint * const *begin, struct tracepoint * const *end)
{
if (!*tracepoint && begin != end) {
*tracepoint = begin;
@@ -534,7 +534,8 @@ static void tracepoint_get_iter(struct tracepoint_iter *iter)
/* Core kernel tracepoints */
if (!iter->module) {
found = tracepoint_get_iter_range(&iter->tracepoint,
__start___tracepoints, __stop___tracepoints);
__start___tracepoints_ptrs,
__stop___tracepoints_ptrs);
if (found)
goto end;
}
@@ -585,8 +586,8 @@ int tracepoint_module_notify(struct notifier_block *self,
switch (val) {
case MODULE_STATE_COMING:
case MODULE_STATE_GOING:
tracepoint_update_probe_range(mod->tracepoints,
mod->tracepoints + mod->num_tracepoints);
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
break;
}
return 0;

53
kernel/watchdog.c
View File

@@ -27,7 +27,7 @@
#include <asm/irq_regs.h>
#include <linux/perf_event.h>
int watchdog_enabled;
int watchdog_enabled = 1;
int __read_mostly softlockup_thresh = 60;
static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts);
@@ -43,9 +43,6 @@ static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
#endif
static int no_watchdog;
/* boot commands */
/*
* Should we panic when a soft-lockup or hard-lockup occurs:
@@ -58,7 +55,7 @@ static int __init hardlockup_panic_setup(char *str)
if (!strncmp(str, "panic", 5))
hardlockup_panic = 1;
else if (!strncmp(str, "0", 1))
no_watchdog = 1;
watchdog_enabled = 0;
return 1;
}
__setup("nmi_watchdog=", hardlockup_panic_setup);
@@ -77,7 +74,7 @@ __setup("softlockup_panic=", softlockup_panic_setup);
static int __init nowatchdog_setup(char *str)
{
no_watchdog = 1;
watchdog_enabled = 0;
return 1;
}
__setup("nowatchdog", nowatchdog_setup);
@@ -85,7 +82,7 @@ __setup("nowatchdog", nowatchdog_setup);
/* deprecated */
static int __init nosoftlockup_setup(char *str)
{
no_watchdog = 1;
watchdog_enabled = 0;
return 1;
}
__setup("nosoftlockup", nosoftlockup_setup);
@@ -366,8 +363,14 @@ static int watchdog_nmi_enable(int cpu)
goto out_save;
}
printk(KERN_ERR "NMI watchdog disabled for cpu%i: unable to create perf event: %ld\n",
cpu, PTR_ERR(event));
/* vary the KERN level based on the returned errno */
if (PTR_ERR(event) == -EOPNOTSUPP)
printk(KERN_INFO "NMI watchdog disabled (cpu%i): not supported (no LAPIC?)\n", cpu);
else if (PTR_ERR(event) == -ENOENT)
printk(KERN_WARNING "NMI watchdog disabled (cpu%i): hardware events not enabled\n", cpu);
else
printk(KERN_ERR "NMI watchdog disabled (cpu%i): unable to create perf event: %ld\n", cpu, PTR_ERR(event));
return PTR_ERR(event);
/* success path */
@@ -432,9 +435,6 @@ static int watchdog_enable(int cpu)
wake_up_process(p);
}
/* if any cpu succeeds, watchdog is considered enabled for the system */
watchdog_enabled = 1;
return 0;
}
@@ -462,12 +462,16 @@ static void watchdog_disable(int cpu)
static void watchdog_enable_all_cpus(void)
{
int cpu;
int result = 0;
watchdog_enabled = 0;
for_each_online_cpu(cpu)
result += watchdog_enable(cpu);
if (!watchdog_enable(cpu))
/* if any cpu succeeds, watchdog is considered
enabled for the system */
watchdog_enabled = 1;
if (result)
if (!watchdog_enabled)
printk(KERN_ERR "watchdog: failed to be enabled on some cpus\n");
}
@@ -476,9 +480,6 @@ static void watchdog_disable_all_cpus(void)
{
int cpu;
if (no_watchdog)
return;
for_each_online_cpu(cpu)
watchdog_disable(cpu);
@@ -498,10 +499,12 @@ int proc_dowatchdog_enabled(struct ctl_table *table, int write,
{
proc_dointvec(table, write, buffer, length, ppos);
if (watchdog_enabled)
watchdog_enable_all_cpus();
else
watchdog_disable_all_cpus();
if (write) {
if (watchdog_enabled)
watchdog_enable_all_cpus();
else
watchdog_disable_all_cpus();
}
return 0;
}
@@ -530,7 +533,8 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
err = watchdog_enable(hotcpu);
if (watchdog_enabled)
err = watchdog_enable(hotcpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_UP_CANCELED:
@@ -555,9 +559,6 @@ void __init lockup_detector_init(void)
void *cpu = (void *)(long)smp_processor_id();
int err;
if (no_watchdog)
return;
err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
WARN_ON(notifier_to_errno(err));