block: don't use cmpxchg64() on 32-bit platform

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I57S8D
CVE: NA

--------------------------------

Some 32-bit platform doesn't support cmpxchg64(), using it in generic
code will cause compile error.

Fixes: 4c8f034bf1e6 ("[Huawei] block: update nsecs[] in part_stat_show() and diskstats_show()")
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

block/blk-core.c

@@ -1292,13 +1292,16 @@ void blk_account_io_done(struct request *req, u64 now)
 	    !(req->rq_flags & RQF_FLUSH_SEQ)) {
 		const int sgrp = op_stat_group(req_op(req));
 		struct hd_struct *part;
+#ifdef CONFIG_64BIT
 		u64 stat_time;
 		struct request_wrapper *rq_wrapper = request_to_wrapper(req);
+#endif
 
 		part_stat_lock();
 		part = req->part;
 		update_io_ticks(part, jiffies, true);
 		part_stat_inc(part, ios[sgrp]);
+#ifdef CONFIG_64BIT
 		stat_time = READ_ONCE(rq_wrapper->stat_time_ns);
 		/*
 		 * This might fail if 'stat_time_ns' is updated
@@ -1312,6 +1315,9 @@ void blk_account_io_done(struct request *req, u64 now)
 
 			part_stat_add(req->part, nsecs[sgrp], duation);
 		}
+#else
+		part_stat_add(part, nsecs[sgrp], now - req->start_time_ns);
+#endif
 		part_stat_unlock();
 
 		hd_struct_put(part);

block/blk-mq.c

@@ -102,6 +102,7 @@ struct mq_inflight {
 	unsigned int inflight[2];
 };
 
+#ifdef CONFIG_64BIT
 static bool blk_mq_check_inflight_with_stat(struct blk_mq_hw_ctx *hctx,
 					    struct request *rq, void *priv,
 					    bool reserved)
@@ -154,7 +155,7 @@ unsigned int blk_mq_in_flight_with_stat(struct request_queue *q,
 
 	return mi.inflight[0] + mi.inflight[1];
 }
-
+#endif
 
 static bool blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx,
 				  struct request *rq, void *priv,

block/blk-mq.h

@@ -187,8 +187,10 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
 unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part);
 void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part,
 			 unsigned int inflight[2]);
+#ifdef CONFIG_64BIT
 unsigned int blk_mq_in_flight_with_stat(struct request_queue *q,
 					struct hd_struct *part);
+#endif
 
 static inline void blk_mq_put_dispatch_budget(struct request_queue *q)
 {

block/genhd.c

@@ -1293,6 +1293,7 @@ ssize_t part_size_show(struct device *dev,
 		(unsigned long long)part_nr_sects_read(p));
 }
 
+#ifdef CONFIG_64BIT
 static void part_set_stat_time(struct hd_struct *hd)
 {
 	u64 now = ktime_get_ns();
@@ -1304,12 +1305,13 @@ static void part_set_stat_time(struct hd_struct *hd)
 		goto again;
 	}
 }
+#endif
 
 static void part_get_stat_info(struct hd_struct *hd, struct disk_stats *stat,
 			       unsigned int *inflight)
 {
+#ifdef CONFIG_64BIT
 	struct request_queue *q = part_to_disk(hd)->queue;
-
 	if (queue_is_mq(q)) {
 		mutex_lock(&part_to_dev(hd)->mutex);
 		part_stat_lock();
@@ -1320,7 +1322,9 @@ static void part_get_stat_info(struct hd_struct *hd, struct disk_stats *stat,
 	} else {
 		*inflight = part_in_flight(hd);
 	}
-
+#else
+	*inflight = part_in_flight(hd);
+#endif
 	if (*inflight) {
 		part_stat_lock();
 		update_io_ticks(hd, jiffies, true);