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From 6bc3b74c6e2b0aaebe1bc164594e53b010efef56 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Fri, 10 Jun 2022 15:52:34 +0900
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Subject: [PATCH 17/18] sbitmapq: Fix for kernels without struct
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wait_queue_head
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The current struct wait_queue_head was renamed by kernel commit
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9d9d676f595b ("sched/wait: Standardize internal naming of wait-queue heads")
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at Linux 4.13. Without the patch, on earlier kernels the "sbitmapq"
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command fails with the following error:
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crash> sbitmapq ffff8801790b3b50
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depth = 128
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busy = 0
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bits_per_word = 32
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...
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sbitmapq: invalid structure member offset: wait_queue_head_head
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FILE: sbitmap.c LINE: 344 FUNCTION: sbitmap_queue_show()
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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sbitmap.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/sbitmap.c b/sbitmap.c
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index bb2f19e6207b..be5d30a8ea88 100644
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--- a/sbitmap.c
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+++ b/sbitmap.c
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@@ -341,7 +341,10 @@ static void sbitmap_queue_show(const struct sbitmap_queue_context *sqc,
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sbq_wait_state_size = SIZE(sbq_wait_state);
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wait_cnt_off = OFFSET(sbq_wait_state_wait_cnt);
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wait_off = OFFSET(sbq_wait_state_wait);
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- list_head_off = OFFSET(wait_queue_head_head);
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+ if (VALID_MEMBER(wait_queue_head_head)) /* 4.13 and later */
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+ list_head_off = OFFSET(wait_queue_head_head);
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+ else
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+ list_head_off = OFFSET(__wait_queue_head_task_list);
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sbq_wait_state_buf = GETBUF(sbq_wait_state_size);
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--
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2.30.2
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