linux-kernel - Patch to include/linux/kernel.h breaks 3rd party modules.

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Date:   Wed, 21 Dec 2016 15:42:05 -0500
From:   Valdis Kletnieks <Valdis.Kletnieks@...edu>
To:     Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Patch to include/linux/kernel.h breaks 3rd party modules.

Yes, I know that usually out-of-tree modules are on their own.
However, this one may require a rethink..

(Sorry for not catching this sooner, I hadn't tried to deal with the
affected module since this patch hit linux-next in next-20161128)

commit 7fd8329ba502ef76dd91db561c7aed696b2c7720
Author: Petr Mladek <pmladek@...e.com>
Date:   Wed Sep 21 13:47:22 2016 +0200

    taint/module: Clean up global and module taint flags handling

Contains this chunk:

--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -506,6 +506,15 @@ extern enum system_states {
 #define TAINT_UNSIGNED_MODULE          13
 #define TAINT_SOFTLOCKUP               14
 #define TAINT_LIVEPATCH                        15
+#define TAINT_FLAGS_COUNT              16
+
+struct taint_flag {
+       char true;      /* character printed when tainted */
+       char false;     /* character printed when not tainted */
+       bool module;    /* also show as a per-module taint flag */
+};

and hilarity ensues when an out-of-tree module has this:

# ifndef true
#  define true  (1)
# endif
# ifndef false
#  define false (0)
# endif

My proposed fix: change true/false to tainted/untainted.  If this
is agreeable, I'll code and submit the fix.

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