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sbitmapq: Fix for kernels without struct wait_queue_head

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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@nec.com>
This commit is contained in:
Kazuhito Hagio 2022-06-10 15:52:34 +09:00
parent c07068266b
commit 6bc3b74c6e
1 changed files with 4 additions and 1 deletions
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5
sbitmap.c
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@ -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);