linux-kernel - [PATCH] bug: avoid Kconfig warning for BUG_ON_DATA

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Date:   Fri, 26 Aug 2016 17:42:00 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Rik van Riel <riel@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] bug: avoid Kconfig warning for BUG_ON_DATA_CORRUPTION

The CONFIG_DEBUG_LIST option is normally meant for kernel developers
rather than production machines and is guarded by CONFIG_DEBUG_KERNEL.

In contrast, the newly added CONFIG_BUG_ON_DATA_CORRUPTION is meant
for security hardening and may be used on systems that intentionally
do not enable CONFIG_DEBUG_KERNEL. In this configuration, we get
a warning from Kconfig about the mismatched dependencies:

warning: (BUG_ON_DATA_CORRUPTION) selects DEBUG_LIST which has unmet direct dependencies (DEBUG_KERNEL)

This annotates the DEBUG_LIST option to be selectable by
BUG_ON_DATA_CORRUPTION when DEBUG_KERNEL is disabled.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: 40cd725cfc7f ("bug: Provide toggle for BUG on data corruption")
---
 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6f5ca0530e47..dd40d4ad9063 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1229,7 +1229,7 @@ config DEBUG_BUGVERBOSE

 config DEBUG_LIST
 	bool "Debug linked list manipulation"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION
 	help
 	  Enable this to turn on extended checks in the linked-list
 	  walking routines.
-- 
2.9.0