The sbitmap_queue.ws_active member was added by kernel commit 5d2ee7122c73
("sbitmap: optimize wakeup check") at Linux 5.0. Without the patch, on
earlier kernels the "sbitmapq" command fails with the following error:
crash> sbitmapq ffff8f1a3611cf10
sbitmapq: invalid structure member offset: sbitmap_queue_ws_active
FILE: sbitmap.c LINE: 393 FUNCTION: sbitmap_queue_context_load()
Signed-off-by: Kazuhito Hagio <k-hagio-ab@xxxxxxx>
---
sbitmap.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/sbitmap.c b/sbitmap.c
index e8ebd62fe01c..37db21d15219 100644
--- a/sbitmap.c
+++ b/sbitmap.c
@@ -325,7 +325,8 @@ static void sbitmap_queue_show(const struct sbitmap_queue_context *sqc,
fprintf(fp, "wake_batch = %u\n", sqc->wake_batch);
fprintf(fp, "wake_index = %d\n", sqc->wake_index);
- fprintf(fp, "ws_active = %d\n", sqc->ws_active);
+ if (VALID_MEMBER(sbitmap_queue_ws_active)) /* 5.0 and later */
+ fprintf(fp, "ws_active = %d\n", sqc->ws_active);
sbq_wait_state_size = SIZE(sbq_wait_state);
wait_cnt_off = OFFSET(sbq_wait_state_wait_cnt);
@@ -380,7 +381,8 @@ static void sbitmap_queue_context_load(ulong addr, struct sbitmap_queue_context
sqc->wake_batch = UINT(sbitmap_queue_buf + OFFSET(sbitmap_queue_wake_batch));
sqc->wake_index = INT(sbitmap_queue_buf + OFFSET(sbitmap_queue_wake_index));
sqc->ws_addr = ULONG(sbitmap_queue_buf + OFFSET(sbitmap_queue_ws));
- sqc->ws_active = INT(sbitmap_queue_buf + OFFSET(sbitmap_queue_ws_active));
+ if (VALID_MEMBER(sbitmap_queue_ws_active))
+ sqc->ws_active = INT(sbitmap_queue_buf + OFFSET(sbitmap_queue_ws_active));
if (VALID_MEMBER(sbitmap_queue_round_robin))
sqc->round_robin = BOOL(sbitmap_queue_buf + OFFSET(sbitmap_queue_round_robin));
sqc->min_shallow_depth = UINT(sbitmap_queue_buf + OFFSET(sbitmap_queue_min_shallow_depth));
--
2.27.0
--
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