Kernel commit <9a14d6ce4135> ("block: remove debugfs blk_mq_ctx
dispatched/merged/completed attributes") removed the member
rq_dispatched and rq_completed from struct blk_mq_ctx. Without
this patch, crash will fail with the following error:
crash> dev -d
MAJOR GENDISK NAME REQUEST_QUEUE TOTAL ASYNC SYNC
dev: invalid structure member offset: blk_mq_ctx_rq_dispatched
FILE: dev.c LINE: 4229 FUNCTION: get_one_mctx_diskio()
Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
---
dev.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/dev.c b/dev.c
index effe789f38d8..dd21511e5dfc 100644
--- a/dev.c
+++ b/dev.c
@@ -4246,6 +4246,10 @@ get_mq_diskio(unsigned long q, unsigned long *mq_count)
unsigned long mctx_addr;
struct diskio tmp;
+ if (!MEMBER_EXISTS("blk_mq_ctx", "rq_dispatched") &&
+ !MEMBER_EXISTS("blk_mq_ctx", "rq_completed"))
+ return;
+
memset(&tmp, 0x00, sizeof(struct diskio));
readmem(q + OFFSET(request_queue_queue_ctx), KVADDR, &queue_ctx,
--
2.20.1
--
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