linux-kernel - [PATCH] mm/kmemleak: make create

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Date:   Thu, 1 Sep 2022 10:30:07 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Liu Shixin <liushixin2@...wei.com>,
        wangkefeng 00584194 <wangkefeng.wang@...wei.com>
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 <liushixin2@...wei.com>
---
 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