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dm-stats: fix dm_jiffies_to_msec64

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There were wrong calculations in dm_jiffies_to_msec64 that produced
incorrect output when HZ was different from 1000. This commit fixes them.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Assisted-by: Claude:claude-opus-4-6
Fixes: fd2ed4d252 ("dm: add statistics support")
Cc: stable@vger.kernel.org
This commit is contained in:
Mikulas Patocka
2026-07-10 18:37:15 +02:00
parent 1917eb2db7
commit 386df1a57b
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-stats.c
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@@ -840,10 +840,10 @@ static unsigned long long dm_jiffies_to_msec64(struct dm_stat *s, unsigned long
result = jiffies_to_msecs(j & 0x3fffff);
if (j >= 1 << 22) {
mult = jiffies_to_msecs(1 << 22);
result += (unsigned long long)mult * (unsigned long long)jiffies_to_msecs((j >> 22) & 0x3fffff);
result += (unsigned long long)mult * ((j >> 22) & 0x3fffff);
}
if (j >= 1ULL << 44)
result += (unsigned long long)mult * (unsigned long long)mult * (unsigned long long)jiffies_to_msecs(j >> 44);
result += (unsigned long long)mult * (unsigned long long)(1 << 22) * (j >> 44);
return result;
}