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-rw-r--r--mm/Kconfig.debug1
-rw-r--r--mm/Makefile2
-rw-r--r--mm/kmemcheck.c125
-rw-r--r--mm/slub.c5
4 files changed, 2 insertions, 131 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 5b0adf1435de..e5e606ee5f71 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -11,7 +11,6 @@ config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
depends on DEBUG_KERNEL
depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
- depends on !KMEMCHECK
select PAGE_EXTENSION
select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
---help---
diff --git a/mm/Makefile b/mm/Makefile
index 4659b93cba43..e7ebd176fb93 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -17,7 +17,6 @@ KCOV_INSTRUMENT_slub.o := n
KCOV_INSTRUMENT_page_alloc.o := n
KCOV_INSTRUMENT_debug-pagealloc.o := n
KCOV_INSTRUMENT_kmemleak.o := n
-KCOV_INSTRUMENT_kmemcheck.o := n
KCOV_INSTRUMENT_memcontrol.o := n
KCOV_INSTRUMENT_mmzone.o := n
KCOV_INSTRUMENT_vmstat.o := n
@@ -70,7 +69,6 @@ obj-$(CONFIG_KSM) += ksm.o
obj-$(CONFIG_PAGE_POISONING) += page_poison.o
obj-$(CONFIG_SLAB) += slab.o
obj-$(CONFIG_SLUB) += slub.o
-obj-$(CONFIG_KMEMCHECK) += kmemcheck.o
obj-$(CONFIG_KASAN) += kasan/
obj-$(CONFIG_FAILSLAB) += failslab.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
diff --git a/mm/kmemcheck.c b/mm/kmemcheck.c
index b3a4d61d341c..cec594032515 100644
--- a/mm/kmemcheck.c
+++ b/mm/kmemcheck.c
@@ -1,126 +1 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/gfp.h>
-#include <linux/mm_types.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include "slab.h"
-#include <linux/kmemcheck.h>
-
-void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
-{
- struct page *shadow;
- int pages;
- int i;
-
- pages = 1 << order;
-
- /*
- * With kmemcheck enabled, we need to allocate a memory area for the
- * shadow bits as well.
- */
- shadow = alloc_pages_node(node, flags, order);
- if (!shadow) {
- if (printk_ratelimit())
- pr_err("kmemcheck: failed to allocate shadow bitmap\n");
- return;
- }
-
- for(i = 0; i < pages; ++i)
- page[i].shadow = page_address(&shadow[i]);
-
- /*
- * Mark it as non-present for the MMU so that our accesses to
- * this memory will trigger a page fault and let us analyze
- * the memory accesses.
- */
- kmemcheck_hide_pages(page, pages);
-}
-
-void kmemcheck_free_shadow(struct page *page, int order)
-{
- struct page *shadow;
- int pages;
- int i;
-
- if (!kmemcheck_page_is_tracked(page))
- return;
-
- pages = 1 << order;
-
- kmemcheck_show_pages(page, pages);
-
- shadow = virt_to_page(page[0].shadow);
-
- for(i = 0; i < pages; ++i)
- page[i].shadow = NULL;
-
- __free_pages(shadow, order);
-}
-
-void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
- size_t size)
-{
- if (unlikely(!object)) /* Skip object if allocation failed */
- return;
-
- /*
- * Has already been memset(), which initializes the shadow for us
- * as well.
- */
- if (gfpflags & __GFP_ZERO)
- return;
-
- /* No need to initialize the shadow of a non-tracked slab. */
- if (s->flags & SLAB_NOTRACK)
- return;
-
- if (!kmemcheck_enabled || gfpflags & __GFP_NOTRACK) {
- /*
- * Allow notracked objects to be allocated from
- * tracked caches. Note however that these objects
- * will still get page faults on access, they just
- * won't ever be flagged as uninitialized. If page
- * faults are not acceptable, the slab cache itself
- * should be marked NOTRACK.
- */
- kmemcheck_mark_initialized(object, size);
- } else if (!s->ctor) {
- /*
- * New objects should be marked uninitialized before
- * they're returned to the called.
- */
- kmemcheck_mark_uninitialized(object, size);
- }
-}
-
-void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size)
-{
- /* TODO: RCU freeing is unsupported for now; hide false positives. */
- if (!s->ctor && !(s->flags & SLAB_TYPESAFE_BY_RCU))
- kmemcheck_mark_freed(object, size);
-}
-
-void kmemcheck_pagealloc_alloc(struct page *page, unsigned int order,
- gfp_t gfpflags)
-{
- int pages;
-
- if (gfpflags & (__GFP_HIGHMEM | __GFP_NOTRACK))
- return;
-
- pages = 1 << order;
-
- /*
- * NOTE: We choose to track GFP_ZERO pages too; in fact, they
- * can become uninitialized by copying uninitialized memory
- * into them.
- */
-
- /* XXX: Can use zone->node for node? */
- kmemcheck_alloc_shadow(page, order, gfpflags, -1);
-
- if (gfpflags & __GFP_ZERO)
- kmemcheck_mark_initialized_pages(page, pages);
- else
- kmemcheck_mark_uninitialized_pages(page, pages);
-}
diff --git a/mm/slub.c b/mm/slub.c
index c2c41e178acf..cfd56e5a35fb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1371,7 +1371,7 @@ static inline void *slab_free_hook(struct kmem_cache *s, void *x)
* So in order to make the debug calls that expect irqs to be
* disabled we need to disable interrupts temporarily.
*/
-#if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP)
+#ifdef CONFIG_LOCKDEP
{
unsigned long flags;
@@ -1399,8 +1399,7 @@ static inline void slab_free_freelist_hook(struct kmem_cache *s,
* Compiler cannot detect this function can be removed if slab_free_hook()
* evaluates to nothing. Thus, catch all relevant config debug options here.
*/
-#if defined(CONFIG_KMEMCHECK) || \
- defined(CONFIG_LOCKDEP) || \
+#if defined(CONFIG_LOCKDEP) || \
defined(CONFIG_DEBUG_KMEMLEAK) || \
defined(CONFIG_DEBUG_OBJECTS_FREE) || \
defined(CONFIG_KASAN)