[Crash-utility] [PATCH 1/2] sbitmapq: Fix for kernels without struct wait_queue_head
The current struct wait_queue_head was renamed by kernel commit
9d9d676f595b ("sched/wait: Standardize internal naming of wait-queue heads")
at Linux 4.13. Without the patch, on earlier kernels the "sbitmapq"
command fails with the following error:
crash> sbitmapq ffff8801790b3b50
depth = 128
busy = 0
bits_per_word = 32
...
sbitmapq: invalid structure member offset: wait_queue_head_head
FILE: sbitmap.c LINE: 344 FUNCTION: sbitmap_queue_show()
Signed-off-by: Kazuhito Hagio <k-hagio-ab(a)nec.com>
---
sbitmap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sbitmap.c b/sbitmap.c
index bb2f19e6207b..be5d30a8ea88 100644
--- a/sbitmap.c
+++ b/sbitmap.c
@@ -341,7 +341,10 @@ static void sbitmap_queue_show(const struct sbitmap_queue_context
*sqc,
sbq_wait_state_size = SIZE(sbq_wait_state);
wait_cnt_off = OFFSET(sbq_wait_state_wait_cnt);
wait_off = OFFSET(sbq_wait_state_wait);
- list_head_off = OFFSET(wait_queue_head_head);
+ if (VALID_MEMBER(wait_queue_head_head)) /* 4.13 and later */
+ list_head_off = OFFSET(wait_queue_head_head);
+ else
+ list_head_off = OFFSET(__wait_queue_head_task_list);
sbq_wait_state_buf = GETBUF(sbq_wait_state_size);
--
2.31.1