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Commit 5aabb433 authored by David Keitel's avatar David Keitel Committed by Swathi Sridhar
Browse files

mm: slub: panic for object and slab errors 



If the SLUB_DEBUG_PANIC_ON Kconfig option is
selected, also panic for object and slab
errors to allow capturing relevant debug
data.

Change-Id: Idc582ef48d3c0d866fa89cf8660ff0a5402f7e15
Signed-off-by: default avatarDavid Keitel <dkeitel@codeaurora.org>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent 802d671c

mm/slub.c

+12 −0
Original line number Diff line number Diff line
@@ -687,11 +687,21 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) 
	dump_stack();

}



#ifdef CONFIG_SLUB_DEBUG_PANIC_ON

static void slab_panic(const char *cause)

{

	panic("%s\n", cause);

}

#else

static inline void slab_panic(const char *cause) {}

#endif



void object_err(struct kmem_cache *s, struct page *page,

			u8 *object, char *reason)

{

	slab_bug(s, "%s", reason);

	print_trailer(s, page, object);

	slab_panic(reason);

}



static __printf(3, 4) void slab_err(struct kmem_cache *s, struct page *page,
@@ -706,6 +716,7 @@ static __printf(3, 4) void slab_err(struct kmem_cache *s, struct page *page, 
	slab_bug(s, "%s", buf);

	print_page_info(page);

	dump_stack();

	slab_panic("slab error");

}



static void init_object(struct kmem_cache *s, void *object, u8 val)
@@ -727,6 +738,7 @@ static void init_object(struct kmem_cache *s, void *object, u8 val) 
static void restore_bytes(struct kmem_cache *s, char *message, u8 data,

						void *from, void *to)

{

	slab_panic("object poison overwritten");

	slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data);

	memset(from, data, to - from);

}