From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 18 Feb 2015 13:17:14 +0000 (+0100)
Subject: s390/traps: panic() instead of die() on translation exception
X-Git-Tag: omap-for-v4.1/fixes-rc1~143^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e1d12d70f7467c3b26cbd0c14139dcddec88448d;p=pandora-kernel.git

s390/traps: panic() instead of die() on translation exception

In case of a translation exception the page tables are corrupted. If the
exception handler then calls die() which again calls show_regs()
-> show_code() -> copy_from_user(), the kernel may access the same memory
location again and generates yet another translation exception. Which in turn
will lead to a deadlock on the die_lock spinlock, which the kernel tries to
grab recursively.

Given that the page tables are corrupted anyway, if we see such an exception,
let's simply panic.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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