block: only use cmpxchg64 in 64bit platform

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I65K8D
CVE: NA

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

Use cmpxchg64() in some 32bit platform will cause compile error, because
it might not be implemented, for example PCC32. Hence only compile it in
64bit platform.

Fixes: 82327165 ("blk-mq: don't access request_wrapper if request is not allocated from block layer")
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

block/blk-core.c

@@ -1306,10 +1306,11 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes)
 
 static void blk_account_io_latency(struct request *req, u64 now, const int sgrp)
 {
+#ifdef CONFIG_64BIT
 	u64 stat_time;
 	struct request_wrapper *rq_wrapper;
 
-	if (!IS_ENABLED(CONFIG_64BIT) || !(req->rq_flags & RQF_FROM_BLOCK)) {
+	if (!(req->rq_flags & RQF_FROM_BLOCK)) {
 		part_stat_add(req->part, nsecs[sgrp], now - req->start_time_ns);
 		return;
 	}
@@ -1328,6 +1329,10 @@ static void blk_account_io_latency(struct request *req, u64 now, const int sgrp)
 
 		part_stat_add(req->part, nsecs[sgrp], duration);
 	}
+#else
+	part_stat_add(req->part, nsecs[sgrp], now - req->start_time_ns);
+
+#endif
 }
 
 void blk_account_io_done(struct request *req, u64 now)