Messages in this thread Patch in this message | | | From | John Garry <> | Subject | [PATCH v3 08/13] blk-mq: Don't clear driver tags own mapping | Date | Fri, 27 Aug 2021 20:01:59 +0800 |
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Function blk_mq_clear_rq_mapping() is required to clear the sched tags mappings in driver tags rqs[].
But there is no need for a driver tags to clear its own mapping, so skip clearing the mapping in this scenario.
Signed-off-by: John Garry <john.garry@huawei.com> --- block/blk-mq.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c index 556c203e6b7c..09380274d2d6 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2316,6 +2316,10 @@ static void blk_mq_clear_rq_mapping(struct blk_mq_tags *drv_tags, struct page *page; unsigned long flags; + /* There is no need to clear a driver tags own mapping */ + if (drv_tags == tags) + return; + list_for_each_entry(page, &tags->page_list, lru) { unsigned long start = (unsigned long)page_address(page); unsigned long end = start + order_to_size(page->private); -- 2.26.2
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