add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/dm-sysfs.c
..
..
@@ -92,7 +92,8 @@
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 static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
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 {
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-	sprintf(buf, "%d\n", dm_use_blk_mq(md));
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+	/* Purely for userspace compatibility */
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+	sprintf(buf, "%d\n", true);
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 	return strlen(buf);
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 }