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From 0d3e86fee5eead93b521a0e20a0e099ede4ab72b 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 13/15] sbitmapq: Fix for sbitmap_word without cleared member
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The sbitmap_word.cleared member was added by kernel commit ea86ea2cdced
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("sbitmap: ammortize cost of clearing bits") at Linux 5.0. Without the
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patch, on earlier kernels the "sbitmapq" command fails with the
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following error:
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crash> sbitmapq ffff8f1a3611cf10
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sbitmapq: invalid structure member offset: sbitmap_word_cleared
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FILE: sbitmap.c LINE: 92 FUNCTION: __sbitmap_weight()
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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sbitmap.c | 26 ++++++++++++++++++--------
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1 file changed, 18 insertions(+), 8 deletions(-)
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diff --git a/sbitmap.c b/sbitmap.c
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index 152c28e6875f..c9f7209f9e3e 100644
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--- a/sbitmap.c
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+++ b/sbitmap.c
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@@ -89,7 +89,6 @@ static unsigned int __sbitmap_weight(const struct sbitmap_context *sc, bool set)
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{
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const ulong sbitmap_word_size = SIZE(sbitmap_word);
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const ulong w_word_off = OFFSET(sbitmap_word_word);
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- const ulong w_cleared_off = OFFSET(sbitmap_word_cleared);
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unsigned int weight = 0;
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ulong addr = sc->map_addr;
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@@ -111,7 +110,10 @@ static unsigned int __sbitmap_weight(const struct sbitmap_context *sc, bool set)
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word = ULONG(sbitmap_word_buf + w_word_off);
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weight += bitmap_weight(word, depth);
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} else {
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- cleared = ULONG(sbitmap_word_buf + w_cleared_off);
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+ if (VALID_MEMBER(sbitmap_word_cleared))
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+ cleared = ULONG(sbitmap_word_buf + OFFSET(sbitmap_word_cleared));
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+ else
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+ cleared = 0;
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weight += bitmap_weight(cleared, depth);
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}
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@@ -130,7 +132,10 @@ static unsigned int sbitmap_weight(const struct sbitmap_context *sc)
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static unsigned int sbitmap_cleared(const struct sbitmap_context *sc)
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{
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- return __sbitmap_weight(sc, false);
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+ if (VALID_MEMBER(sbitmap_word_cleared)) /* 5.0 and later */
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+ return __sbitmap_weight(sc, false);
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+
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+ return 0;
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}
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static void sbitmap_emit_byte(unsigned int offset, uint8_t byte)
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@@ -149,7 +154,6 @@ static void sbitmap_bitmap_show(const struct sbitmap_context *sc)
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{
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const ulong sbitmap_word_size = SIZE(sbitmap_word);
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const ulong w_word_off = OFFSET(sbitmap_word_word);
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- const ulong w_cleared_off = OFFSET(sbitmap_word_cleared);
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uint8_t byte = 0;
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unsigned int byte_bits = 0;
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@@ -169,7 +173,10 @@ static void sbitmap_bitmap_show(const struct sbitmap_context *sc)
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}
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word = ULONG(sbitmap_word_buf + w_word_off);
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- cleared = ULONG(sbitmap_word_buf + w_cleared_off);
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+ if (VALID_MEMBER(sbitmap_word_cleared))
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+ cleared = ULONG(sbitmap_word_buf + OFFSET(sbitmap_word_cleared));
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+ else
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+ cleared = 0;
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word_bits = __map_depth(sc, i);
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word &= ~cleared;
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@@ -219,7 +226,6 @@ static void __sbitmap_for_each_set(const struct sbitmap_context *sc,
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{
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const ulong sbitmap_word_size = SIZE(sbitmap_word);
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const ulong w_word_off = OFFSET(sbitmap_word_word);
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- const ulong w_cleared_off = OFFSET(sbitmap_word_cleared);
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unsigned int index;
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unsigned int nr;
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@@ -245,7 +251,10 @@ static void __sbitmap_for_each_set(const struct sbitmap_context *sc,
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}
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w_word = ULONG(sbitmap_word_buf + w_word_off);
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- w_cleared = ULONG(sbitmap_word_buf + w_cleared_off);
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+ if (VALID_MEMBER(sbitmap_word_cleared))
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+ w_cleared = ULONG(sbitmap_word_buf + OFFSET(sbitmap_word_cleared));
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+ else
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+ w_cleared = 0;
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depth = min(__map_depth(sc, index) - nr, sc->depth - scanned);
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@@ -297,7 +306,8 @@ static void sbitmap_queue_show(const struct sbitmap_queue_context *sqc,
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fprintf(fp, "depth = %u\n", sc->depth);
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fprintf(fp, "busy = %u\n", sbitmap_weight(sc) - sbitmap_cleared(sc));
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- fprintf(fp, "cleared = %u\n", sbitmap_cleared(sc));
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+ if (VALID_MEMBER(sbitmap_word_cleared)) /* 5.0 and later */
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+ fprintf(fp, "cleared = %u\n", sbitmap_cleared(sc));
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fprintf(fp, "bits_per_word = %u\n", 1U << sc->shift);
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fprintf(fp, "map_nr = %u\n", sc->map_nr);
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--
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2.30.2
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