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kmemleak: free internal objects only if there're no leaks to be reported

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Currently if you stop kmemleak thread before disabling kmemleak,
kmemleak objects will be freed and so you won't be able to check
previously reported leaks.

With this patch, kmemleak objects won't be freed if there're leaks that
can be reported.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2014-04-03 14:46:26 -07:00 committed by Linus Torvalds
parent 81c98869fa
commit dc9b3f4249
1 changed files with 9 additions and 4 deletions
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13
mm/kmemleak.c
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@ -218,7 +218,8 @@ static int kmemleak_stack_scan = 1;
static DEFINE_MUTEX(scan_mutex);
/* setting kmemleak=on, will set this var, skipping the disable */
static int kmemleak_skip_disable;
/* If there are leaks that can be reported */
static bool kmemleak_found_leaks;
/*
* Early object allocation/freeing logging. Kmemleak is initialized after the
@ -1382,9 +1383,12 @@ static void kmemleak_scan(void)
}
rcu_read_unlock();
if (new_leaks)
if (new_leaks) {
kmemleak_found_leaks = true;
pr_info("%d new suspected memory leaks (see "
"/sys/kernel/debug/kmemleak)\n", new_leaks);
}
}
@ -1592,6 +1596,8 @@ static void kmemleak_clear(void)
spin_unlock_irqrestore(&object->lock, flags);
}
rcu_read_unlock();
kmemleak_found_leaks = false;
}
/*
@ -1685,12 +1691,11 @@ static const struct file_operations kmemleak_fops = {
static void kmemleak_do_cleanup(struct work_struct *work)
{
struct kmemleak_object *object;
bool cleanup = scan_thread == NULL;
mutex_lock(&scan_mutex);
stop_scan_thread();
if (cleanup) {
if (!kmemleak_found_leaks) {
rcu_read_lock();
list_for_each_entry_rcu(object, &object_list, object_list)
delete_object_full(object->pointer);