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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_KMEMCHECK_H
#define LINUX_KMEMCHECK_H
#include <linux/mm_types.h>
#include <linux/types.h>
#ifdef CONFIG_KMEMCHECK
extern int kmemcheck_enabled;
/* The slab-related functions. */
void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node);
void kmemcheck_free_shadow(struct page *page, int order);
void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
size_t size);
void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size);
void kmemcheck_pagealloc_alloc(struct page *p, unsigned int order,
gfp_t gfpflags);
void kmemcheck_show_pages(struct page *p, unsigned int n);
void kmemcheck_hide_pages(struct page *p, unsigned int n);
bool kmemcheck_page_is_tracked(struct page *p);
void kmemcheck_mark_unallocated(void *address, unsigned int n);
void kmemcheck_mark_uninitialized(void *address, unsigned int n);
void kmemcheck_mark_initialized(void *address, unsigned int n);
void kmemcheck_mark_freed(void *address, unsigned int n);
void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n);
void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n);
void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n);
int kmemcheck_show_addr(unsigned long address);
int kmemcheck_hide_addr(unsigned long address);
bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size);
/*
* Bitfield annotations
*
* How to use: If you have a struct using bitfields, for example
*
* struct a {
* int x:8, y:8;
* };
*
* then this should be rewritten as
*
* struct a {
* kmemcheck_bitfield_begin(flags);
* int x:8, y:8;
* kmemcheck_bitfield_end(flags);
* };
*
* Now the "flags_begin" and "flags_end" members may be used to refer to the
* beginning and end, respectively, of the bitfield (and things like
* &x.flags_begin is allowed). As soon as the struct is allocated, the bit-
* fields should be annotated:
*
* struct a *a = kmalloc(sizeof(struct a), GFP_KERNEL);
* kmemcheck_annotate_bitfield(a, flags);
*/
#define kmemcheck_bitfield_begin(name) \
int name##_begin[0];
#define kmemcheck_bitfield_end(name) \
int name##_end[0];
#define kmemcheck_annotate_bitfield(ptr, name) \
do { \
int _n; \
\
if (!ptr) \
break; \
\
_n = (long) &((ptr)->name##_end) \
- (long) &((ptr)->name##_begin); \
BUILD_BUG_ON(_n < 0); \
\
kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \
} while (0)
#define kmemcheck_annotate_variable(var) \
do { \
kmemcheck_mark_initialized(&(var), sizeof(var)); \
} while (0) \
#else
#define kmemcheck_enabled 0
static inline void
kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
{
}
static inline void
kmemcheck_free_shadow(struct page *page, int order)
{
}
static inline void
kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
size_t size)
{
}
static inline void kmemcheck_slab_free(struct kmem_cache *s, void *object,
size_t size)
{
}
static inline void kmemcheck_pagealloc_alloc(struct page *p,
unsigned int order, gfp_t gfpflags)
{
}
static inline bool kmemcheck_page_is_tracked(struct page *p)
{
return false;
}
static inline void kmemcheck_mark_unallocated(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_uninitialized(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_initialized(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_freed(void *address, unsigned int n)
{
}
static inline void kmemcheck_mark_unallocated_pages(struct page *p,
unsigned int n)
{
}
static inline void kmemcheck_mark_uninitialized_pages(struct page *p,
unsigned int n)
{
}
static inline void kmemcheck_mark_initialized_pages(struct page *p,
unsigned int n)
{
}
static inline bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size)
{
return true;
}
#define kmemcheck_bitfield_begin(name)
#define kmemcheck_bitfield_end(name)
#define kmemcheck_annotate_bitfield(ptr, name) \
do { \
} while (0)
#define kmemcheck_annotate_variable(var) \
do { \
} while (0)
#endif /* CONFIG_KMEMCHECK */
#endif /* LINUX_KMEMCHECK_H */
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