bpf_arena_common.h

 1/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
 2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
 3#pragma once
 4
 5#ifndef arena_container_of
 6#define arena_container_of(ptr, type, member)			\
 7	({							\
 8		void __arena *__mptr = (void __arena *)(ptr);	\
 9		((type *)(__mptr - offsetof(type, member)));	\
10	})
11#endif
12
13/* Provide the definition of PAGE_SIZE. */
14#include <sys/user.h>
15
16#define __arena
17#define __arg_arena
18#define cast_kern(ptr) /* nop for user space */
19#define cast_user(ptr) /* nop for user space */
20char __attribute__((weak)) arena[1];
21
22#ifndef offsetof
23#define offsetof(type, member)  ((unsigned long)&((type *)0)->member)
24#endif
25
26static inline void __arena* bpf_arena_alloc_pages(void *map, void *addr, __u32 page_cnt,
27						  int node_id, __u64 flags)
28{
29	return NULL;
30}
31static inline void bpf_arena_free_pages(void *map, void __arena *ptr, __u32 page_cnt)
32{
33}