[PATCH] dm-stats: fix dm_jiffies_to_msec64

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 <[email protected]>
Assisted-by: Claude:claude-opus-4-6
Fixes: fd2ed4d25270 ("dm: add statistics support")
Cc: [email protected]

---
 drivers/md/dm-stats.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/md/dm-stats.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-stats.c	2026-07-10 15:38:59.000000000 +0200
+++ linux-2.6/drivers/md/dm-stats.c	2026-07-10 18:16:41.000000000 +0200
@@ -840,10 +840,10 @@ static unsigned long long dm_jiffies_to_
 		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;
 }