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md/raid0: fix bug with chunksize not a power of 2.
Since commit 20d0189 in v3.14-rc1 RAID0 has performed incorrect calculations when the chunksize is not a power of 2. This happens because "sector_div()" modifies its first argument, but this wasn't taken into account in the patch. So restore that first arg before re-using the variable. Reported-by: Joe Landman <[email protected]> Reported-by: Dave Chinner <[email protected]> Fixes: 20d0189 Cc: [email protected] (3.14 and later). Signed-off-by: NeilBrown <[email protected]>
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