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blk-wbt: Eliminate ambiguity in the comments of struct rq_wb

In the current implementation, the last_issue and last_comp members of
struct rq_wb are used only by read requests and not by non-throttled write
requests. Therefore, eliminate the ambiguity here.

Signed-off-by: Tang Yizhou <yizhou.tang@shopee.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20250727173959.160835-3-yizhou.tang@shopee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

authored by

Tang Yizhou and committed by
Jens Axboe bccdfcd5 d8b96a79

+2 -2
+2 -2
block/blk-wbt.c
··· 85 85 u64 sync_issue; 86 86 void *sync_cookie; 87 87 88 - unsigned long last_issue; /* last non-throttled issue */ 89 - unsigned long last_comp; /* last non-throttled comp */ 88 + unsigned long last_issue; /* issue time of last read rq */ 89 + unsigned long last_comp; /* completion time of last read rq */ 90 90 unsigned long min_lat_nsec; 91 91 struct rq_qos rqos; 92 92 struct rq_wait rq_wait[WBT_NUM_RWQ];