[PATCH 3.4 128/172] writeback: fix possible underflow in write bandwidth calculation

From: lizf
Date: Tue Jun 16 2015 - 05:06:32 EST


From: Tejun Heo <tj@xxxxxxxxxx>

3.4.108-rc1 review patch. If anyone has any objections, please let me know.

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commit c72efb658f7c8b27ca3d0efb5cfd5ded9fcac89e upstream.