Add zen_workaround to our repo

It previously lived at https://gist.github.com/glandium/01d54cefdb70561b5f6675e08f2990f2

Resolves #3690

.gitignore

@@ -35,3 +35,10 @@ share/
 libbrotli*
 extra_version_string.h
 git_revision.h
+third-party/zen-pmu-workaround/.*
+third-party/zen-pmu-workaround/*.ko
+third-party/zen-pmu-workaround/*.o
+third-party/zen-pmu-workaround/*.mod
+third-party/zen-pmu-workaround/*.mod.c
+third-party/zen-pmu-workaround/Module.symvers
+third-party/zen-pmu-workaround/modules.order

LICENSE

@@ -48,13 +48,364 @@ DEALINGS IN THE SOFTWARE.
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-third-party/gdb:
+====================================================================================
+
+The following applies only to files under third-party/gdb:
+
 <!-- Copyright (C) 2010-2014 Free Software Foundation, Inc.
      Copying and distribution of this file, with or without modification,
      are permitted in any medium without royalty provided the copyright
      notice and this notice are preserved.  -->
 
-src/test/dlchecksum.c:
+====================================================================================
+
+The following applies only to files under third-party/zen-pmu-workaround:
+
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
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+
+====================================================================================
+
+The following applies only to src/test/dlchecksum.c:
+
 /*
   Copyright (C) The Julia contributors.
   Copyright (C) 2013 Mark Adler

third-party/zen-pmu-workaround/Makefile

@@ -0,0 +1,7 @@
+obj-m = zen_workaround.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

third-party/zen-pmu-workaround/README

@@ -0,0 +1,5 @@
+Zen workaround kernel module, Copyright 2020, Mike Hommey.
+
+This has the same effect as `scripts/zen_workaround.py`, but persists after resuming from sleep.
+
+There is no upstream, but we put it in third-party because it's technically a derived work of the Linux kernel. The license is GPL 2.0. See LICENSE at the root of this repo.