linux-kernel - [PATCH 4/9] mm: kmemleak: add kmemleak_noscan

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Date:   Mon, 23 Jan 2023 11:04:14 -0600
From:   George Prekas <george@...abrica.net>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Andrei Vagin <avagin@...il.com>,
        George Prekas <george@...abrica.net>
Subject: [PATCH 4/9] mm: kmemleak: add kmemleak_noscan_phys function

This function should be used instead of kmemleak_noscan when the object
has been registered with kmemleak_alloc_phys.

Signed-off-by: George Prekas <george@...abrica.net>
---
 include/linux/kmemleak.h |  4 ++++
 mm/kmemleak.c            | 20 +++++++++++++++++---
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/include/linux/kmemleak.h b/include/linux/kmemleak.h
index 1e2e8deac6dc..42069e0c1ac8 100644
--- a/include/linux/kmemleak.h
+++ b/include/linux/kmemleak.h
@@ -29,6 +29,7 @@ extern void kmemleak_not_leak(const void *ptr) __ref;
 extern void kmemleak_ignore(const void *ptr) __ref;
 extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref;
 extern void kmemleak_no_scan(const void *ptr) __ref;
+extern void kmemleak_no_scan_phys(phys_addr_t phys) __ref;
 extern void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
 				gfp_t gfp) __ref;
 extern void kmemleak_free_part_phys(phys_addr_t phys, size_t size) __ref;
@@ -106,6 +107,9 @@ static inline void kmemleak_erase(void **ptr)
 static inline void kmemleak_no_scan(const void *ptr)
 {
 }
+static inline void kmemleak_no_scan_phys(phys_addr_t phys)
+{
+}
 static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
 				       gfp_t gfp)
 {
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 5882f60d127c..6e037dcf322f 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -939,12 +939,12 @@ static void object_set_excess_ref(unsigned long ptr, unsigned long excess_ref)
  * pointer. Such object will not be scanned by kmemleak but references to it
  * are searched.
  */
-static void object_no_scan(unsigned long ptr)
+static void object_no_scan(unsigned long ptr, bool is_phys)
 {
 	unsigned long flags;
 	struct kmemleak_object *object;
 
-	object = find_and_get_object(ptr, 0);
+	object = __find_and_get_object(ptr, 0, is_phys);
 	if (!object) {
 		kmemleak_warn("Not scanning unknown object at 0x%08lx\n", ptr);
 		return;
@@ -1188,10 +1188,24 @@ void __ref kmemleak_no_scan(const void *ptr)
 	pr_debug("%s(0x%p)\n", __func__, ptr);
 
 	if (kmemleak_enabled && ptr && !IS_ERR(ptr))
-		object_no_scan((unsigned long)ptr);
+		object_no_scan((unsigned long)ptr, false);
 }
 EXPORT_SYMBOL(kmemleak_no_scan);
 
+/**
+ * kmemleak_no_scan_phys - similar to kmemleak_no_scan but taking a physical
+ *			   address argument
+ * @phys:	physical address of the object
+ */
+void __ref kmemleak_no_scan_phys(phys_addr_t phys)
+{
+	pr_debug("%s(0x%pa)\n", __func__, &phys);
+
+	if (kmemleak_enabled && phys)
+		object_no_scan((unsigned long)phys, true);
+}
+EXPORT_SYMBOL(kmemleak_no_scan_phys);
+
 /**
  * kmemleak_alloc_phys - similar to kmemleak_alloc but taking a physical
  *			 address argument
-- 
2.37.1