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[mm,v3,09/34] kasan: clear metadata functions for tag-based modes

Message ID 470fbe5d15e8015092e76e395de354be18ccceab.1662411799.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series kasan: switch tag-based modes to stack ring from per-object metadata | expand

Commit Message

andrey.konovalov@linux.dev Sept. 5, 2022, 9:05 p.m. UTC 
From: Andrey Konovalov <andreyknvl@google.com>

Remove implementations of the metadata-related functions for the tag-based
modes.

The following patches in the series will provide alternative
implementations.

As of this patch, the tag-based modes no longer collect alloc and free
stack traces. This functionality will be restored later in the series.

Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 mm/kasan/tags.c | 33 ++-------------------------------
 1 file changed, 2 insertions(+), 31 deletions(-)
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Patch

diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
index 2e200969a4b8..f11c89505c77 100644
--- a/mm/kasan/tags.c
+++ b/mm/kasan/tags.c
@@ -19,54 +19,25 @@ 
 
 void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
 {
-	struct kasan_alloc_meta *alloc_meta;
-
-	alloc_meta = kasan_get_alloc_meta(cache, object);
-	if (alloc_meta)
-		__memset(alloc_meta, 0, sizeof(*alloc_meta));
 }
 
 void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
 {
-	struct kasan_alloc_meta *alloc_meta;
-
-	alloc_meta = kasan_get_alloc_meta(cache, object);
-	if (alloc_meta)
-		kasan_set_track(&alloc_meta->alloc_track, flags);
 }
 
 void kasan_save_free_info(struct kmem_cache *cache,
 				void *object, u8 tag)
 {
-	struct kasan_alloc_meta *alloc_meta;
-
-	alloc_meta = kasan_get_alloc_meta(cache, object);
-	if (!alloc_meta)
-		return;
-
-	kasan_set_track(&alloc_meta->free_track, GFP_NOWAIT);
 }
 
 struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
 						void *object)
 {
-	struct kasan_alloc_meta *alloc_meta;
-
-	alloc_meta = kasan_get_alloc_meta(cache, object);
-	if (!alloc_meta)
-		return NULL;
-
-	return &alloc_meta->alloc_track;
+	return NULL;
 }
 
 struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
 						void *object, u8 tag)
 {
-	struct kasan_alloc_meta *alloc_meta;
-
-	alloc_meta = kasan_get_alloc_meta(cache, object);
-	if (!alloc_meta)
-		return NULL;
-
-	return &alloc_meta->free_track;
+	return NULL;
 }