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

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Message-ID: <20161221212346.fxav4c4niyqpa6bv@jeyu>
Date:   Wed, 21 Dec 2016 13:23:46 -0800
From:   Jessica Yu <jeyu@...hat.com>
To:     Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:     Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: Patch to include/linux/kernel.h breaks 3rd party modules.

+++ Valdis Kletnieks [21/12/16 15:42 -0500]:
>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.

Sure, that's fine with me.

Jessica