linux-kernel - [PATCH] um: Re-enable verbose panic()

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Message-Id: <20170712205356.23042-1-richard@nod.at>
Date:   Wed, 12 Jul 2017 22:53:56 +0200
From:   Richard Weinberger <richard@....at>
To:     user-mode-linux-devel@...ts.sourceforge.net
Cc:     linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [PATCH] um: Re-enable verbose panic()

Commit 9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
rightfully removed GENERIC_BUG from UML because UML didn't use
that feature.
A side effect of this is that DEBUG_BUGVERBOSE no longer
set and therefore panic() doesn't print a stack trace.

Let's select DEBUG_BUGVERBOSE manually to have a verbose panic()
again.

Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Richard Weinberger <richard@....at>
---
 arch/um/Kconfig.common | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index 85f6dd204ab6..3cb6cd80ee4c 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -13,6 +13,8 @@ config UML
 	select GENERIC_CLOCKEVENTS
 	select HAVE_GCC_PLUGINS
 	select TTY # Needed for line.c
+	select HAVE_DEBUG_BUGVERBOSE
+	select DEBUG_BUGVERBOSE
 
 config MMU
 	bool
-- 
2.12.3