linux-kernel - LOCALVERSION_AUTO considered harmful

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Message-ID: <20100411164701.GA7558@elf.ucw.cz>
Date:	Sun, 11 Apr 2010 18:47:01 +0200
From:	Pavel Machek <pavel@....cz>
To:	kernel list <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...l.org>
Subject: LOCALVERSION_AUTO considered harmful

LOCALVERSION_AUTO has nasty interaction with modules, warn about it.

Signed-off-by: Pavel Machek <pavel@....cz>

diff --git a/init/Kconfig b/init/Kconfig
index eb77e8c..5d33072 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -88,7 +88,6 @@ config LOCALVERSION
 
 config LOCALVERSION_AUTO
 	bool "Automatically append version information to the version string"
-	default y
 	help
 	  This will try to automatically determine if the current tree is a
 	  release tree by looking for git tags that belong to the current
@@ -99,6 +98,11 @@ config LOCALVERSION_AUTO
 	  appended after any matching localversion* files, and after the value
 	  set in CONFIG_LOCALVERSION.
 
+	  Unfortunately, such finegrained versioning will mean that you will
+	  not be able to use modules for development; even "make modules"
+	  will change module versions, making recompiled modules impossible
+	  to insert into old kernel. 
+
 	  (The actual string used here is the first eight characters produced
 	  by running the command:
 

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