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Merge branches 'core-urgent-for-linus', 'perf-urgent-for-linus' and 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  debugobjects: Fix boot crash when kmemleak and debugobjects enabled

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  jump_label: Fix jump_label update for modules
  oprofile, x86: Fix race in nmi handler while starting counters

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: Disable (revert) SCHED_LOAD_SCALE increase
  sched, cgroups: Fix MIN_SHARES on 64-bit boxen
This commit is contained in:
Linus Torvalds 2011-07-07 13:17:45 -07:00
commit 27a3b735b7
5 changed files with 24 additions and 17 deletions
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14
arch/x86/oprofile/nmi_int.c
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@ -112,8 +112,10 @@ static void nmi_cpu_start(void *dummy)
static int nmi_start(void)
{
get_online_cpus();
on_each_cpu(nmi_cpu_start, NULL, 1);
ctr_running = 1;
/* make ctr_running visible to the nmi handler: */
smp_mb();
on_each_cpu(nmi_cpu_start, NULL, 1);
put_online_cpus();
return 0;
}
@ -504,15 +506,18 @@ static int nmi_setup(void)
nmi_enabled = 0;
ctr_running = 0;
barrier();
/* make variables visible to the nmi handler: */
smp_mb();
err = register_die_notifier(&profile_exceptions_nb);
if (err)
goto fail;
get_online_cpus();
register_cpu_notifier(&oprofile_cpu_nb);
on_each_cpu(nmi_cpu_setup, NULL, 1);
nmi_enabled = 1;
/* make nmi_enabled visible to the nmi handler: */
smp_mb();
on_each_cpu(nmi_cpu_setup, NULL, 1);
put_online_cpus();
return 0;
@ -531,7 +536,8 @@ static void nmi_shutdown(void)
nmi_enabled = 0;
ctr_running = 0;
put_online_cpus();
barrier();
/* make variables visible to the nmi handler: */
smp_mb();
unregister_die_notifier(&profile_exceptions_nb);
msrs = &get_cpu_var(cpu_msrs);
model->shutdown(msrs);

2
include/linux/sched.h
View File

@ -808,7 +808,7 @@ enum cpu_idle_type {
* when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
* increased costs.
*/
#if BITS_PER_LONG > 32
#if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
# define SCHED_LOAD_RESOLUTION 10
# define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
# define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)

14
kernel/jump_label.c
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@ -375,15 +375,19 @@ int jump_label_text_reserved(void *start, void *end)
static void jump_label_update(struct jump_label_key *key, int enable)
{
struct jump_entry *entry = key->entries;
/* if there are no users, entry can be NULL */
if (entry)
__jump_label_update(key, entry, __stop___jump_table, enable);
struct jump_entry *entry = key->entries, *stop = __stop___jump_table;
#ifdef CONFIG_MODULES
struct module *mod = __module_address((jump_label_t)key);
__jump_label_mod_update(key, enable);
if (mod)
stop = mod->jump_entries + mod->num_jump_entries;
#endif
/* if there are no users, entry can be NULL */
if (entry)
__jump_label_update(key, entry, stop, enable);
}
#endif

9
kernel/sched.c
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@ -292,8 +292,8 @@ static DEFINE_SPINLOCK(task_group_lock);
* (The default weight is 1024 - so there's no practical
* limitation from this.)
*/
#define MIN_SHARES 2
#define MAX_SHARES (1UL << (18 + SCHED_LOAD_RESOLUTION))
#define MIN_SHARES (1UL << 1)
#define MAX_SHARES (1UL << 18)
static int root_task_group_load = ROOT_TASK_GROUP_LOAD;
#endif
@ -8450,10 +8450,7 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
if (!tg->se[0])
return -EINVAL;
if (shares < MIN_SHARES)
shares = MIN_SHARES;
else if (shares > MAX_SHARES)
shares = MAX_SHARES;
shares = clamp(shares, scale_load(MIN_SHARES), scale_load(MAX_SHARES));
mutex_lock(&shares_mutex);
if (tg->shares == shares)

2
lib/debugobjects.c
View File

@ -198,7 +198,7 @@ static void free_object(struct debug_obj *obj)
* initialized:
*/
if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache)
sched = !work_pending(&debug_obj_work);
sched = keventd_up() && !work_pending(&debug_obj_work);
hlist_add_head(&obj->node, &obj_pool);
obj_pool_free++;
obj_pool_used--;