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UBI: fix mean EC calculation
authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Sat, 19 Apr 2008 17:44:31 +0000 (20:44 +0300)
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Sat, 19 Apr 2008 17:49:41 +0000 (20:49 +0300)
(a + b) / (c + d) != a / c + b / d. The old code errornously
assumed this incorrect formuld. Instead, just sum all erase
counters in a 64-bit variable and divide to the number of EBs
at the end.

Thanks to Adrian Hunter for pointing this out.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

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