[S390] debug: enable exception-trace debug facility

The exception-trace facility on x86 and other architectures prints
traces to dmesg whenever a user space application crashes.
s390 has such a feature since ages however it is called
userprocess_debug and is enabled differently.
This patch makes sure that whenever one of the two procfs files

/proc/sys/kernel/userprocess_debug
/proc/sys/debug/exception-trace

is modified the contents of the second one changes as well.
That way we keep backwards compatibilty but also support the same
interface like other architectures do.
Besides that the output of the traces is improved since it will now
also contain the corresponding filename of the vma (when available)
where the process caused a fault or trap.

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

1 files changed, 0 insertions, 7 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 0d8cd9bbe101..79d0ca086820 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -444,13 +444,6 @@ config FORCE_MAX_ZONEORDER
         int
         default "9"
 
-config PROCESS_DEBUG
-        bool "Show crashed user process info"
-        help
-          Say Y to print all process fault locations to the console.  This is
-          a debugging option; you probably do not want to set it unless you
-          are an S390 port maintainer.
-
 config PFAULT
         bool "Pseudo page fault support"
         help