From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Wed, 12 Feb 2014 14:36:59 +0000 (-0500)
Subject: NFSv4.1: Fix wraparound issues in pnfs_seqid_is_newer()
X-Git-Tag: v3.15-rc1~66^2~12^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c64c57dfc4b7946f7abd8af653f55af581bc2c3;p=pandora-kernel.git

NFSv4.1: Fix wraparound issues in pnfs_seqid_is_newer()

Subtraction of signed integers does not have well defined wraparound
semantics in the C99 standard. In order to be wraparound-safe, we
have to use unsigned subtraction, and then cast the result.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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