#ifndef _FLEX_ARRAY_H #define _FLEX_ARRAY_H #include <linux/types.h> #include <asm/page.h> #define FLEX_ARRAY_PART_SIZE PAGE_SIZE #define FLEX_ARRAY_BASE_SIZE PAGE_SIZE struct flex_array_part; /* * This is meant to replace cases where an array-like * structure has gotten too big to fit into kmalloc() * and the developer is getting tempted to use * vmalloc(). */ struct flex_array { union { struct { int element_size; int total_nr_elements; struct flex_array_part *parts[0]; }; /* * This little trick makes sure that * sizeof(flex_array) == PAGE_SIZE */ char padding[FLEX_ARRAY_BASE_SIZE]; }; }; #define FLEX_ARRAY_INIT(size, total) { { {\ .element_size = (size), \ .total_nr_elements = (total), \ } } } struct flex_array *flex_array_alloc(int element_size, int total, gfp_t flags); int flex_array_prealloc(struct flex_array *fa, int start, int end, gfp_t flags); void flex_array_free(struct flex_array *fa); void flex_array_free_parts(struct flex_array *fa); int flex_array_put(struct flex_array *fa, int element_nr, void *src, gfp_t flags); void *flex_array_get(struct flex_array *fa, int element_nr); #endif /* _FLEX_ARRAY_H */