Commit f7cb1933 authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
Browse files

SLUB: Pass active and inactive redzone flags instead of boolean to debug functions 



Pass the actual values used for inactive and active redzoning to the
functions that check the objects. Avoids a lot of the ? : things to
lookup the values in the functions.

Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
parent 7340cc84

mm/slub.c

+14 −19
Original line number Diff line number Diff line
@@ -490,7 +490,7 @@ static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...) 
	dump_stack();

}



static void init_object(struct kmem_cache *s, void *object, int active)

static void init_object(struct kmem_cache *s, void *object, u8 val)

{

	u8 *p = object;
@@ -500,9 +500,7 @@ static void init_object(struct kmem_cache *s, void *object, int active) 
	}



	if (s->flags & SLAB_RED_ZONE)

		memset(p + s->objsize,

			active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE,

			s->inuse - s->objsize);

		memset(p + s->objsize, val, s->inuse - s->objsize);

}



static u8 *check_bytes(u8 *start, unsigned int value, unsigned int bytes)
@@ -637,17 +635,14 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page) 
}



static int check_object(struct kmem_cache *s, struct page *page,

					void *object, int active)

					void *object, u8 val)

{

	u8 *p = object;

	u8 *endobject = object + s->objsize;



	if (s->flags & SLAB_RED_ZONE) {

		unsigned int red =

			active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE;



		if (!check_bytes_and_report(s, page, object, "Redzone",

			endobject, red, s->inuse - s->objsize))

			endobject, val, s->inuse - s->objsize))

			return 0;

	} else {

		if ((s->flags & SLAB_POISON) && s->objsize < s->inuse) {
@@ -657,7 +652,7 @@ static int check_object(struct kmem_cache *s, struct page *page, 
	}



	if (s->flags & SLAB_POISON) {

		if (!active && (s->flags & __OBJECT_POISON) &&

		if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) &&

			(!check_bytes_and_report(s, page, p, "Poison", p,

					POISON_FREE, s->objsize - 1) ||

			 !check_bytes_and_report(s, page, p, "Poison",
@@ -669,7 +664,7 @@ static int check_object(struct kmem_cache *s, struct page *page, 
		check_pad_bytes(s, page, p);

	}



	if (!s->offset && active)

	if (!s->offset && val == SLUB_RED_ACTIVE)

		/*

		 * Object and freepointer overlap. Cannot check

		 * freepointer while object is allocated.
@@ -887,7 +882,7 @@ static void setup_object_debug(struct kmem_cache *s, struct page *page, 
	if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON)))

		return;



	init_object(s, object, 0);

	init_object(s, object, SLUB_RED_INACTIVE);

	init_tracking(s, object);

}
@@ -907,14 +902,14 @@ static noinline int alloc_debug_processing(struct kmem_cache *s, struct page *pa 
		goto bad;

	}



	if (!check_object(s, page, object, 0))

	if (!check_object(s, page, object, SLUB_RED_INACTIVE))

		goto bad;



	/* Success perform special debug activities for allocs */

	if (s->flags & SLAB_STORE_USER)

		set_track(s, object, TRACK_ALLOC, addr);

	trace(s, page, object, 1);

	init_object(s, object, 1);

	init_object(s, object, SLUB_RED_ACTIVE);

	return 1;



bad:
@@ -947,7 +942,7 @@ static noinline int free_debug_processing(struct kmem_cache *s, 
		goto fail;

	}



	if (!check_object(s, page, object, 1))

	if (!check_object(s, page, object, SLUB_RED_ACTIVE))

		return 0;



	if (unlikely(s != page->slab)) {
@@ -971,7 +966,7 @@ static noinline int free_debug_processing(struct kmem_cache *s, 
	if (s->flags & SLAB_STORE_USER)

		set_track(s, object, TRACK_FREE, addr);

	trace(s, page, object, 0);

	init_object(s, object, 0);

	init_object(s, object, SLUB_RED_INACTIVE);

	return 1;



fail:
@@ -1075,7 +1070,7 @@ static inline int free_debug_processing(struct kmem_cache *s, 
static inline int slab_pad_check(struct kmem_cache *s, struct page *page)

			{ return 1; }

static inline int check_object(struct kmem_cache *s, struct page *page,

			void *object, int active) { return 1; }

			void *object, u8 val) { return 1; }

static inline void add_full(struct kmem_cache_node *n, struct page *page) {}

static inline unsigned long kmem_cache_flags(unsigned long objsize,

	unsigned long flags, const char *name,
@@ -1235,7 +1230,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page) 
		slab_pad_check(s, page);

		for_each_object(p, s, page_address(page),

						page->objects)

			check_object(s, page, p, 0);

			check_object(s, page, p, SLUB_RED_INACTIVE);

	}



	kmemcheck_free_shadow(page, compound_order(page));
@@ -2143,7 +2138,7 @@ static void early_kmem_cache_node_alloc(int node) 
	page->inuse++;

	kmem_cache_node->node[node] = n;

#ifdef CONFIG_SLUB_DEBUG

	init_object(kmem_cache_node, n, 1);

	init_object(kmem_cache_node, n, SLUB_RED_ACTIVE);

	init_tracking(kmem_cache_node, n);

#endif

	init_kmem_cache_node(n, kmem_cache_node);