2022-09-01 02:45:33

by Liu Shixin

Subject: [PATCH] mm/kmemleak: make create_object return void

No user cares about the return value of create_object,
so make it return void.

Signed-off-by: Liu Shixin <[email protected]>
---
mm/kmemleak.c | 21 +++++++++------------
1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 1eddc0132f7f..37af2dc8dac9 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -604,9 +604,8 @@ static int __save_stack_trace(unsigned long *trace)
* memory block and add it to the object_list and object_tree_root (or
* object_phys_tree_root).
*/
-static struct kmemleak_object *__create_object(unsigned long ptr, size_t size,
- int min_count, gfp_t gfp,
- bool is_phys)
+static void __create_object(unsigned long ptr, size_t size,
+ int min_count, gfp_t gfp, bool is_phys)
{
unsigned long flags;
struct kmemleak_object *object, *parent;
@@ -618,7 +617,7 @@ static struct kmemleak_object *__create_object(unsigned long ptr, size_t size,
if (!object) {
pr_warn("Cannot allocate a kmemleak_object structure\n");
kmemleak_disable();
- return NULL;
+ return;
}

INIT_LIST_HEAD(&object->object_list);
@@ -687,7 +686,6 @@ static struct kmemleak_object *__create_object(unsigned long ptr, size_t size,
*/
dump_object_info(parent);
kmem_cache_free(object_cache, object);
- object = NULL;
goto out;
}
}
@@ -698,21 +696,20 @@ static struct kmemleak_object *__create_object(unsigned long ptr, size_t size,
list_add_tail_rcu(&object->object_list, &object_list);
out:
raw_spin_unlock_irqrestore(&kmemleak_lock, flags);
- return object;
}

/* Create kmemleak object which allocated with virtual address. */
-static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
- int min_count, gfp_t gfp)
+static void create_object(unsigned long ptr, size_t size,
+ int min_count, gfp_t gfp)
{
- return __create_object(ptr, size, min_count, gfp, false);
+ __create_object(ptr, size, min_count, gfp, false);
}

/* Create kmemleak object which allocated with physical address. */
-static struct kmemleak_object *create_object_phys(unsigned long ptr, size_t size,
- int min_count, gfp_t gfp)
+static void create_object_phys(unsigned long ptr, size_t size,
+ int min_count, gfp_t gfp)
{
- return __create_object(ptr, size, min_count, gfp, true);
+ __create_object(ptr, size, min_count, gfp, true);
}

/*
--
2.25.1

2022-09-04 10:56:45

by Catalin Marinas

Subject: Re: [PATCH] mm/kmemleak: make create_object return void

On Thu, Sep 01, 2022 at 10:30:07AM +0800, Liu Shixin wrote:
> No user cares about the return value of create_object,
> so make it return void.
>
> Signed-off-by: Liu Shixin <[email protected]>

Acked-by: Catalin Marinas <[email protected]>