stackdepot.h

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/*
 * DCL stackdepot.h -- lockdep/debug backtraces that are never kept.
 *
 * drm_mm.c (CONFIG_DRM_DEBUG_MM) and drm_modeset_lock.c save stacks into
 * depot handles when debugging allocations; the store is a fixed handle of
 * 0 and the fetch reports an empty stack, so dump paths print "no stack"
 * and nothing is allocated.
 */
#ifndef _LINUX_STACKDEPOT_H
#define _LINUX_STACKDEPOT_H
 
#include <linux/types.h>
#include <linux/gfp.h>
 
typedef u32 depot_stack_handle_t;
 
static inline depot_stack_handle_t stack_depot_save(unsigned long *entries,
                            unsigned int nr_entries,
                            gfp_t gfp_flags)
{
    (void)entries; (void)nr_entries; (void)gfp_flags;
    return 0;
}
 
static inline void stack_depot_init(void) { }
 
static inline int stack_depot_fetch(depot_stack_handle_t handle,
                    unsigned long ***entries)
{
    (void)handle;
    *entries = 0;
    return 0;
}
 
static inline int stack_depot_snprint(depot_stack_handle_t handle, char *buf,
                      size_t size, unsigned int skip)
{
    (void)handle; (void)buf; (void)size; (void)skip;
    return 0;
}
 
static inline void stack_depot_print(depot_stack_handle_t handle)
{
    (void)handle;
}
 
#endif /* _LINUX_STACKDEPOT_H */