linux-kernel - bad changes to object building recently

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Date:   Tue, 01 Oct 2019 10:27:37 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     linux-kernel@...r.kernel.org
Subject: bad changes to object building recently

I don't know what has caused this but I am hitting two big problems
which are severely effecting my daily workflow:

1) Something is grinding like crazy when just building a single
   object like "make path/to/foo.o", it looks like make is churning
   on lots of work.

   This used to be instantaneous and is essential for my build sanity
   checking when I apply networking patches.

2) You no longer can do a "make path/to/foo.o" to force an object file
   to be built outside of your current config.  This is also essential
   for my workflow, I can force build objects only enable'able on
   other platforms and it works %95 of the time for basic build sanity
   checking.

Someone please track down these problems and fix them.

Thank you.