diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/Kconfig | 2 | ||||
| -rw-r--r-- | kernel/power/process.c | 29 | ||||
| -rw-r--r-- | kernel/power/snapshot.c | 41 |
3 files changed, 47 insertions, 25 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 79833170bb9..6233f3b4ae6 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -190,7 +190,7 @@ config APM_EMULATION notification of APM "events" (e.g. battery status change). In order to use APM, you will need supporting software. For location - and more information, read <file:Documentation/pm.txt> and the + and more information, read <file:Documentation/power/pm.txt> and the Battery Powered Linux mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>. diff --git a/kernel/power/process.c b/kernel/power/process.c index 7c2118f9597..f1d0b345c9b 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -75,22 +75,15 @@ void refrigerator(void) __set_current_state(save); } -static void fake_signal_wake_up(struct task_struct *p, int resume) +static void fake_signal_wake_up(struct task_struct *p) { unsigned long flags; spin_lock_irqsave(&p->sighand->siglock, flags); - signal_wake_up(p, resume); + signal_wake_up(p, 0); spin_unlock_irqrestore(&p->sighand->siglock, flags); } -static void send_fake_signal(struct task_struct *p) -{ - if (task_is_stopped(p)) - force_sig_specific(SIGSTOP, p); - fake_signal_wake_up(p, task_is_stopped(p)); -} - static int has_mm(struct task_struct *p) { return (p->mm && !(p->flags & PF_BORROWED_MM)); @@ -121,7 +114,7 @@ static int freeze_task(struct task_struct *p, int with_mm_only) if (freezing(p)) { if (has_mm(p)) { if (!signal_pending(p)) - fake_signal_wake_up(p, 0); + fake_signal_wake_up(p); } else { if (with_mm_only) ret = 0; @@ -135,7 +128,7 @@ static int freeze_task(struct task_struct *p, int with_mm_only) } else { if (has_mm(p)) { set_freeze_flag(p); - send_fake_signal(p); + fake_signal_wake_up(p); } else { if (with_mm_only) { ret = 0; @@ -182,15 +175,17 @@ static int try_to_freeze_tasks(int freeze_user_space) if (frozen(p) || !freezeable(p)) continue; - if (task_is_traced(p) && frozen(p->parent)) { - cancel_freezing(p); - continue; - } - if (!freeze_task(p, freeze_user_space)) continue; - if (!freezer_should_skip(p)) + /* + * Now that we've done set_freeze_flag, don't + * perturb a task in TASK_STOPPED or TASK_TRACED. + * It is "frozen enough". If the task does wake + * up, it will immediately call try_to_freeze. + */ + if (!task_is_stopped_or_traced(p) && + !freezer_should_skip(p)) todo++; } while_each_thread(g, p); read_unlock(&tasklist_lock); diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 72a020cabb4..5f91a07c4ea 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -447,7 +447,7 @@ static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free) * of @bm->cur_zone_bm are updated. */ -static void memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, +static int memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, void **addr, unsigned int *bit_nr) { struct zone_bitmap *zone_bm; @@ -461,7 +461,8 @@ static void memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, while (pfn < zone_bm->start_pfn || pfn >= zone_bm->end_pfn) { zone_bm = zone_bm->next; - BUG_ON(!zone_bm); + if (!zone_bm) + return -EFAULT; } bm->cur.zone_bm = zone_bm; } @@ -479,23 +480,40 @@ static void memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, pfn -= bb->start_pfn; *bit_nr = pfn % BM_BITS_PER_CHUNK; *addr = bb->data + pfn / BM_BITS_PER_CHUNK; + return 0; } static void memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn) { void *addr; unsigned int bit; + int error; - memory_bm_find_bit(bm, pfn, &addr, &bit); + error = memory_bm_find_bit(bm, pfn, &addr, &bit); + BUG_ON(error); set_bit(bit, addr); } +static int mem_bm_set_bit_check(struct memory_bitmap *bm, unsigned long pfn) +{ + void *addr; + unsigned int bit; + int error; + + error = memory_bm_find_bit(bm, pfn, &addr, &bit); + if (!error) + set_bit(bit, addr); + return error; +} + static void memory_bm_clear_bit(struct memory_bitmap *bm, unsigned long pfn) { void *addr; unsigned int bit; + int error; - memory_bm_find_bit(bm, pfn, &addr, &bit); + error = memory_bm_find_bit(bm, pfn, &addr, &bit); + BUG_ON(error); clear_bit(bit, addr); } @@ -503,8 +521,10 @@ static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn) { void *addr; unsigned int bit; + int error; - memory_bm_find_bit(bm, pfn, &addr, &bit); + error = memory_bm_find_bit(bm, pfn, &addr, &bit); + BUG_ON(error); return test_bit(bit, addr); } @@ -709,8 +729,15 @@ static void mark_nosave_pages(struct memory_bitmap *bm) region->end_pfn << PAGE_SHIFT); for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++) - if (pfn_valid(pfn)) - memory_bm_set_bit(bm, pfn); + if (pfn_valid(pfn)) { + /* + * It is safe to ignore the result of + * mem_bm_set_bit_check() here, since we won't + * touch the PFNs for which the error is + * returned anyway. + */ + mem_bm_set_bit_check(bm, pfn); + } } } |