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Date: Tue, 1 Mar 2016 09:36:10 +0300
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Gustavo Padovan <gustavo@padovan.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        devel@driverdev.osuosl.org, Rob Clark <robdclark@gmail.com>,
        Daniel Stone <daniels@collabora.com>,
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        Arve =?iso-8859-1?B?SGr4bm5lduVn?= <arve@android.com>,
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        John Harrison <John.C.Harrison@Intel.com>
Subject: Re: [PATCH v4 1/5] staging/android: add num_fences field to struct
 sync_file_info
Message-ID: <20160301063610.GY32153@mwanda>
References: <1456511507-2534-1-git-send-email-gustavo@padovan.org>
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This breaks userspace.  You used to be able to figure it out from
info->len - sizeof(struct sync_file_info).

regards,
dan carpenter