Function free_seg_walk

dpdk/lib/eal/linux/eal_memalloc.c:948–1009

	struct rte_memseg *ms;
};
static int
free_seg_walk(const struct rte_memseg_list *msl, void *arg)
{
	struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
	struct rte_memseg_list *found_msl;
	struct free_walk_param *wa = arg;
	uintptr_t start_addr, end_addr;
	int msl_idx, seg_idx, ret, dir_fd = -1;
	const struct internal_config *internal_conf =
		eal_get_internal_configuration();

	start_addr = (uintptr_t) msl->base_va;
	end_addr = start_addr + msl->len;

	if ((uintptr_t)wa->ms->addr < start_addr ||
			(uintptr_t)wa->ms->addr >= end_addr)
		return 0;

	msl_idx = msl - mcfg->memsegs;
	seg_idx = RTE_PTR_DIFF(wa->ms->addr, start_addr) / msl->page_sz;

	/* msl is const */
	found_msl = &mcfg->memsegs[msl_idx];

	/* do not allow any page allocations during the time we're freeing,
	 * because file creation and locking operations are not atomic,
	 * and we might be the first or the last ones to use a particular page,
	 * so we need to ensure atomicity of every operation.
	 *
	 * during init, we already hold a write lock, so don't try to take out
	 * another one.
	 */
	if (wa->hi->lock_descriptor == -1 && !internal_conf->in_memory) {
		dir_fd = open(wa->hi->hugedir, O_RDONLY);
		if (dir_fd < 0) {
			RTE_LOG(ERR, EAL, "%s(): Cannot open '%s': %s\n",
				__func__, wa->hi->hugedir, strerror(errno));
			return -1;
		}
		/* blocking writelock */
		if (flock(dir_fd, LOCK_EX)) {
			RTE_LOG(ERR, EAL, "%s(): Cannot lock '%s': %s\n",
				__func__, wa->hi->hugedir, strerror(errno));
			close(dir_fd);
			return -1;
		}
	}

	found_msl->version++;

	rte_fbarray_set_free(&found_msl->memseg_arr, seg_idx);

	ret = free_seg(wa->ms, wa->hi, msl_idx, seg_idx);

	if (dir_fd >= 0)
		close(dir_fd);

	if (ret < 0)