From mboxrd@z Thu Jan  1 00:00:00 1970
From: Denis Efremov <efremov@linux.com>
Subject: Re: [PATCH] drm/client: remove the exporting of drm_client_close
Date: Thu, 4 Jul 2019 19:31:30 +0300
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To: Emil Velikov <emil.l.velikov@gmail.com>
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> 
> Out of curiosity: Did you use some tool to spot this?
> 

Just regular expressions:
https://github.com/evdenis/export_checking

But it's not very reliable because of false positives. I think I can try
to implement this kind of check as a part of modpost in addition to
CONFIG_DEBUG_SECTION_MISMATCH.

Denis