tree e5c3daa56821c33ea80b6853b4f817193b22df99
parent 57b28f66316d287b9dbf7b28358ca90257230769
author Heiko Carstens <heiko.carstens@de.ibm.com> 1274083221 +0200
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1274083217 +0200

[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>