patches/old/samples-kmemleak-print-the-raw-pointers-for-debugging-purposes.patch

From: Catalin Marinas <catalin.marinas@arm.com>
Subject: samples: kmemleak: print the raw pointers for debugging purposes
Date: Thu, 6 Feb 2025 11:45:37 +0000

The kmemleak-test.c module is meant to leak some pointers for debugging
the kmemleak detection, pointer information dumping.  It's no use if it
prints the hashed values of such pointers.

Change the printk() format from %p to %px.  While at it, also display the
raw __percpu pointer rather than this_cpu_ptr() since kmemleak now tracks
such pointers independently of the standard allocations.

Link: https://lkml.kernel.org/r/20250206114537.2597764-3-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 samples/kmemleak/kmemleak-test.c |   36 ++++++++++++++---------------
 1 file changed, 18 insertions(+), 18 deletions(-)

--- a/samples/kmemleak/kmemleak-test.c~samples-kmemleak-print-the-raw-pointers-for-debugging-purposes
+++ a/samples/kmemleak/kmemleak-test.c
@@ -40,25 +40,25 @@ static int kmemleak_test_init(void)
 	pr_info("Kmemleak testing\n");
 
 	/* make some orphan objects */
-	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
-	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
-	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
-	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
-	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
-	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
-	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
-	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
+	pr_info("kmalloc(32) = 0x%px\n", kmalloc(32, GFP_KERNEL));
+	pr_info("kmalloc(32) = 0x%px\n", kmalloc(32, GFP_KERNEL));
+	pr_info("kmalloc(1024) = 0x%px\n", kmalloc(1024, GFP_KERNEL));
+	pr_info("kmalloc(1024) = 0x%px\n", kmalloc(1024, GFP_KERNEL));
+	pr_info("kmalloc(2048) = 0x%px\n", kmalloc(2048, GFP_KERNEL));
+	pr_info("kmalloc(2048) = 0x%px\n", kmalloc(2048, GFP_KERNEL));
+	pr_info("kmalloc(4096) = 0x%px\n", kmalloc(4096, GFP_KERNEL));
+	pr_info("kmalloc(4096) = 0x%px\n", kmalloc(4096, GFP_KERNEL));
 #ifndef CONFIG_MODULES
-	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
+	pr_info("kmem_cache_alloc(files_cachep) = 0x%px\n",
 		kmem_cache_alloc(files_cachep, GFP_KERNEL));
-	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
+	pr_info("kmem_cache_alloc(files_cachep) = 0x%px\n",
 		kmem_cache_alloc(files_cachep, GFP_KERNEL));
 #endif
-	pr_info("vmalloc(64) = %p\n", vmalloc(64));
-	pr_info("vmalloc(64) = %p\n", vmalloc(64));
-	pr_info("vmalloc(64) = %p\n", vmalloc(64));
-	pr_info("vmalloc(64) = %p\n", vmalloc(64));
-	pr_info("vmalloc(64) = %p\n", vmalloc(64));
+	pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
+	pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
+	pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
+	pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
+	pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
 
 	/*
 	 * Add elements to a list. They should only appear as orphan
@@ -66,7 +66,7 @@ static int kmemleak_test_init(void)
 	 */
 	for (i = 0; i < 10; i++) {
 		elem = kzalloc(sizeof(*elem), GFP_KERNEL);
-		pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
+		pr_info("kzalloc(sizeof(*elem)) = 0x%px\n", elem);
 		if (!elem)
 			return -ENOMEM;
 		INIT_LIST_HEAD(&elem->list);
@@ -75,11 +75,11 @@ static int kmemleak_test_init(void)
 
 	for_each_possible_cpu(i) {
 		per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
-		pr_info("kmalloc(129) = %p\n",
+		pr_info("kmalloc(129) = 0x%px\n",
 			per_cpu(kmemleak_test_pointer, i));
 	}
 
-	pr_info("__alloc_percpu(64, 4) = %p\n", __alloc_percpu(64, 4));
+	pr_info("__alloc_percpu(64, 4) = 0x%px\n", __alloc_percpu(64, 4));
 
 	return 0;
 }
_