The sbitmap_queue.min_shallow_depth member was added by kernel commit
a327553965de ("sbitmap: fix missed wakeups caused by sbitmap_queue_get_shallow()")
at Linux 4.18. Without the patch, on earlier kernels the "sbitmapq"
command fails with the following error:
crash> sbitmapq ffff89bb7638ee50
sbitmapq: invalid structure member offset: sbitmap_queue_min_shallow_depth
FILE: sbitmap.c LINE: 398 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 c8c9f2b6d003..500246ec6bea 100644
--- a/sbitmap.c
+++ b/sbitmap.c
@@ -371,7 +371,8 @@ static void sbitmap_queue_show(const struct sbitmap_queue_context *sqc,
else if (VALID_MEMBER(sbitmap_round_robin)) /* 5.13 and later */
fprintf(fp, "round_robin = %d\n", sc->round_robin);
- fprintf(fp, "min_shallow_depth = %u\n", sqc->min_shallow_depth);
+ if (VALID_MEMBER(sbitmap_queue_min_shallow_depth)) /* 4.18 and later */
+ fprintf(fp, "min_shallow_depth = %u\n", sqc->min_shallow_depth);
}
static void sbitmap_queue_context_load(ulong addr, struct sbitmap_queue_context *sqc)
@@ -395,7 +396,8 @@ static void sbitmap_queue_context_load(ulong addr, struct sbitmap_queue_context
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));
+ if (VALID_MEMBER(sbitmap_queue_min_shallow_depth))
+ sqc->min_shallow_depth = UINT(sbitmap_queue_buf + OFFSET(sbitmap_queue_min_shallow_depth));
FREEBUF(sbitmap_queue_buf);
}
--
2.27.0
--
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