Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * The implementation of the wait_bit*() and related waiting APIs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include "sched.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #define WAIT_TABLE_BITS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #define WAIT_TABLE_SIZE (1 << WAIT_TABLE_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) static wait_queue_head_t bit_wait_table[WAIT_TABLE_SIZE] __cacheline_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) wait_queue_head_t *bit_waitqueue(void *word, int bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	const int shift = BITS_PER_LONG == 32 ? 5 : 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	unsigned long val = (unsigned long)word << shift | bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	return bit_wait_table + hash_long(val, WAIT_TABLE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) EXPORT_SYMBOL(bit_waitqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) int wake_bit_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct wait_bit_key *key = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct wait_bit_queue_entry *wait_bit = container_of(wq_entry, struct wait_bit_queue_entry, wq_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	if (wait_bit->key.flags != key->flags ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 			wait_bit->key.bit_nr != key->bit_nr ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 			test_bit(key->bit_nr, key->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	return autoremove_wake_function(wq_entry, mode, sync, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) EXPORT_SYMBOL(wake_bit_function);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * To allow interruptible waiting and asynchronous (i.e. nonblocking)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * waiting, the actions of __wait_on_bit() and __wait_on_bit_lock() are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * permitted return codes. Nonzero return codes halt waiting and return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) int __sched
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) __wait_on_bit(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	      wait_bit_action_f *action, unsigned mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		prepare_to_wait(wq_head, &wbq_entry->wq_entry, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		if (test_bit(wbq_entry->key.bit_nr, wbq_entry->key.flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			ret = (*action)(&wbq_entry->key, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	} while (test_bit(wbq_entry->key.bit_nr, wbq_entry->key.flags) && !ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	finish_wait(wq_head, &wbq_entry->wq_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) EXPORT_SYMBOL(__wait_on_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) int __sched out_of_line_wait_on_bit(void *word, int bit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				    wait_bit_action_f *action, unsigned mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	struct wait_queue_head *wq_head = bit_waitqueue(word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	DEFINE_WAIT_BIT(wq_entry, word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	return __wait_on_bit(wq_head, &wq_entry, action, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) EXPORT_SYMBOL(out_of_line_wait_on_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) int __sched out_of_line_wait_on_bit_timeout(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	void *word, int bit, wait_bit_action_f *action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	unsigned mode, unsigned long timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct wait_queue_head *wq_head = bit_waitqueue(word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	DEFINE_WAIT_BIT(wq_entry, word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	wq_entry.key.timeout = jiffies + timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return __wait_on_bit(wq_head, &wq_entry, action, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) EXPORT_SYMBOL_GPL(out_of_line_wait_on_bit_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) int __sched
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) __wait_on_bit_lock(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			wait_bit_action_f *action, unsigned mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		prepare_to_wait_exclusive(wq_head, &wbq_entry->wq_entry, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if (test_bit(wbq_entry->key.bit_nr, wbq_entry->key.flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			ret = action(&wbq_entry->key, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			 * See the comment in prepare_to_wait_event().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			 * finish_wait() does not necessarily takes wwq_head->lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			 * but test_and_set_bit() implies mb() which pairs with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			 * smp_mb__after_atomic() before wake_up_page().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 				finish_wait(wq_head, &wbq_entry->wq_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		if (!test_and_set_bit(wbq_entry->key.bit_nr, wbq_entry->key.flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 				finish_wait(wq_head, &wbq_entry->wq_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		} else if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) EXPORT_SYMBOL(__wait_on_bit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int __sched out_of_line_wait_on_bit_lock(void *word, int bit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 					 wait_bit_action_f *action, unsigned mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct wait_queue_head *wq_head = bit_waitqueue(word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	DEFINE_WAIT_BIT(wq_entry, word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return __wait_on_bit_lock(wq_head, &wq_entry, action, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) EXPORT_SYMBOL(out_of_line_wait_on_bit_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) void __wake_up_bit(struct wait_queue_head *wq_head, void *word, int bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	struct wait_bit_key key = __WAIT_BIT_KEY_INITIALIZER(word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (waitqueue_active(wq_head))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		__wake_up(wq_head, TASK_NORMAL, 1, &key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) EXPORT_SYMBOL(__wake_up_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * wake_up_bit - wake up a waiter on a bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * @word: the word being waited on, a kernel virtual address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * @bit: the bit of the word being waited on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * There is a standard hashed waitqueue table for generic use. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * is the part of the hashtable's accessor API that wakes up waiters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * on a bit. For instance, if one were to have waiters on a bitflag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * one would call wake_up_bit() after clearing the bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * In order for this to function properly, as it uses waitqueue_active()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * internally, some kind of memory barrier must be done prior to calling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * this. Typically, this will be smp_mb__after_atomic(), but in some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * cases where bitflags are manipulated non-atomically under a lock, one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * may need to use a less regular barrier, such fs/inode.c's smp_mb(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  * because spin_unlock() does not guarantee a memory barrier.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void wake_up_bit(void *word, int bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	__wake_up_bit(bit_waitqueue(word, bit), word, bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) EXPORT_SYMBOL(wake_up_bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) wait_queue_head_t *__var_waitqueue(void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return bit_wait_table + hash_ptr(p, WAIT_TABLE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) EXPORT_SYMBOL(__var_waitqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) var_wake_function(struct wait_queue_entry *wq_entry, unsigned int mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		  int sync, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	struct wait_bit_key *key = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct wait_bit_queue_entry *wbq_entry =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		container_of(wq_entry, struct wait_bit_queue_entry, wq_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (wbq_entry->key.flags != key->flags ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	    wbq_entry->key.bit_nr != key->bit_nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return autoremove_wake_function(wq_entry, mode, sync, key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry, void *var, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	*wbq_entry = (struct wait_bit_queue_entry){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		.key = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			.flags	= (var),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			.bit_nr = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		.wq_entry = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 			.flags	 = flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			.private = current,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			.func	 = var_wake_function,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			.entry	 = LIST_HEAD_INIT(wbq_entry->wq_entry.entry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) EXPORT_SYMBOL(init_wait_var_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) void wake_up_var(void *var)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	__wake_up_bit(__var_waitqueue(var), var, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) EXPORT_SYMBOL(wake_up_var);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) __sched int bit_wait(struct wait_bit_key *word, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (signal_pending_state(mode, current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) EXPORT_SYMBOL(bit_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) __sched int bit_wait_io(struct wait_bit_key *word, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	io_schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (signal_pending_state(mode, current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) EXPORT_SYMBOL(bit_wait_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) __sched int bit_wait_timeout(struct wait_bit_key *word, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	unsigned long now = READ_ONCE(jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (time_after_eq(now, word->timeout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	schedule_timeout(word->timeout - now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (signal_pending_state(mode, current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) EXPORT_SYMBOL_GPL(bit_wait_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) __sched int bit_wait_io_timeout(struct wait_bit_key *word, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	unsigned long now = READ_ONCE(jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (time_after_eq(now, word->timeout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	io_schedule_timeout(word->timeout - now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (signal_pending_state(mode, current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		return -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) EXPORT_SYMBOL_GPL(bit_wait_io_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) void __init wait_bit_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	for (i = 0; i < WAIT_TABLE_SIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		init_waitqueue_head(bit_wait_table + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }