1 // SPDX-License-Identifier: GPL-2.0
51 	if (fd == -1)  in read_file()
54 	numread = read(fd, buf, buflen - 1);  in read_file()
72 	if (fd == -1) {  in write_file()
78 	numwritten = write(fd, buf, buflen - 1);  in write_file()
112 int thp_read_string(const char *name, const char * const strings[])  in thp_read_string()  argument
137 	memmove(buf, c, sizeof(buf) - (c - buf));  in thp_read_string()
147 	while (strings[ret]) {  in thp_read_string()
148 		if (!strcmp(strings[ret], buf))  in thp_read_string()
207 		.thp_enabled = thp_read_string("enabled", thp_enabled_strings),  in thp_read_settings()
213 	settings->khugepaged = (struct khugepaged_settings) {  in thp_read_settings()
225 		settings->read_ahead_kb = read_num(dev_queue_read_ahead_path);  in thp_read_settings()
229 			settings->hugepages[i].enabled = THP_NEVER;  in thp_read_settings()
232 		snprintf(path, PATH_MAX, "hugepages-%ukB/enabled",  in thp_read_settings()
234 		settings->hugepages[i].enabled =  in thp_read_settings()
241 	struct khugepaged_settings *khugepaged = &settings->khugepaged;  in thp_write_settings()
244 	int enabled;  in thp_write_settings()  local
247 	thp_write_string("enabled", thp_enabled_strings[settings->thp_enabled]);  in thp_write_settings()
248 	thp_write_string("defrag", thp_defrag_strings[settings->thp_defrag]);  in thp_write_settings()
250 			shmem_enabled_strings[settings->shmem_enabled]);  in thp_write_settings()
251 	thp_write_num("use_zero_page", settings->use_zero_page);  in thp_write_settings()
253 	thp_write_num("khugepaged/defrag", khugepaged->defrag);  in thp_write_settings()
255 			khugepaged->alloc_sleep_millisecs);  in thp_write_settings()
257 			khugepaged->scan_sleep_millisecs);  in thp_write_settings()
258 	thp_write_num("khugepaged/max_ptes_none", khugepaged->max_ptes_none);  in thp_write_settings()
259 	thp_write_num("khugepaged/max_ptes_swap", khugepaged->max_ptes_swap);  in thp_write_settings()
260 	thp_write_num("khugepaged/max_ptes_shared", khugepaged->max_ptes_shared);  in thp_write_settings()
261 	thp_write_num("khugepaged/pages_to_scan", khugepaged->pages_to_scan);  in thp_write_settings()
264 		write_num(dev_queue_read_ahead_path, settings->read_ahead_kb);  in thp_write_settings()
269 		snprintf(path, PATH_MAX, "hugepages-%ukB/enabled",  in thp_write_settings()
271 		enabled = settings->hugepages[i].enabled;  in thp_write_settings()
272 		thp_write_string(path, thp_enabled_strings[enabled]);  in thp_write_settings()
282 	return settings_stack + settings_index - 1;  in thp_current_settings()
301 	--settings_index;  in thp_pop_settings()
324 	dev_queue_read_ahead_path[sizeof(dev_queue_read_ahead_path) - 1] = '\0';  in thp_set_read_ahead_path()
336 		ret = snprintf(path, PATH_MAX, THP_SYSFS "hugepages-%ukB/enabled",  in thp_supported_orders()