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

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.

Change-Id: I31c837fa63f99f65a553471de46729d8d8e08ed5
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>
Git-commit: dc9b3f424903f7d6992778b69b1e35d864914ae5
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/
Signed-off-by: Vignesh Radhakrishnan <vigneshr@codeaurora.org>
This commit is contained in:
Li Zefan 2014-04-03 14:46:26 -07:00 committed by Vignesh Radhakrishnan
parent 29a16158e9
commit ec6034080b
1 changed files with 9 additions and 4 deletions
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13
mm/kmemleak.c
View File

@ -228,7 +228,8 @@ 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
@ -1392,9 +1393,12 @@ 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);
}
}
@ -1602,6 +1606,8 @@ static void kmemleak_clear(void)
spin_unlock_irqrestore(&object->lock, flags);
}
rcu_read_unlock();
kmemleak_found_leaks = false;
}
/*
@ -1695,12 +1701,11 @@ 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);