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From 12fe6c7cdd768f87ce6e903a2bbfb0c0591585c5 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 11:49:47 +0900
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Subject: [PATCH 14/15] sbitmapq: Fix for sbitmap_queue without
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min_shallow_depth member
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The sbitmap_queue.min_shallow_depth member was added by kernel commit
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a327553965de ("sbitmap: fix missed wakeups caused by sbitmap_queue_get_shallow()")
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at Linux 4.18. Without the patch, on earlier kernels the "sbitmapq"
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command fails with the following error:
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crash> sbitmapq ffff89bb7638ee50
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sbitmapq: invalid structure member offset: sbitmap_queue_min_shallow_depth
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FILE: sbitmap.c LINE: 398 FUNCTION: sbitmap_queue_context_load()
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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sbitmap.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/sbitmap.c b/sbitmap.c
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index c9f7209f9e3e..bb2f19e6207b 100644
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--- a/sbitmap.c
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+++ b/sbitmap.c
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@@ -371,7 +371,8 @@ static void sbitmap_queue_show(const struct sbitmap_queue_context *sqc,
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else if (VALID_MEMBER(sbitmap_round_robin)) /* 5.13 and later */
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fprintf(fp, "round_robin = %d\n", sc->round_robin);
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- fprintf(fp, "min_shallow_depth = %u\n", sqc->min_shallow_depth);
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+ if (VALID_MEMBER(sbitmap_queue_min_shallow_depth)) /* 4.18 and later */
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+ fprintf(fp, "min_shallow_depth = %u\n", sqc->min_shallow_depth);
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}
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static void sbitmap_queue_context_load(ulong addr, struct sbitmap_queue_context *sqc)
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@@ -395,7 +396,8 @@ static void sbitmap_queue_context_load(ulong addr, struct sbitmap_queue_context
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sqc->ws_active = INT(sbitmap_queue_buf + OFFSET(sbitmap_queue_ws_active));
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if (VALID_MEMBER(sbitmap_queue_round_robin))
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sqc->round_robin = BOOL(sbitmap_queue_buf + OFFSET(sbitmap_queue_round_robin));
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- sqc->min_shallow_depth = UINT(sbitmap_queue_buf + OFFSET(sbitmap_queue_min_shallow_depth));
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+ if (VALID_MEMBER(sbitmap_queue_min_shallow_depth))
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+ sqc->min_shallow_depth = UINT(sbitmap_queue_buf + OFFSET(sbitmap_queue_min_shallow_depth));
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FREEBUF(sbitmap_queue_buf);
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}
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--
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2.30.2
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