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[S390] debug: enable exception-trace debug facility

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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>
This commit is contained in:
Heiko Carstens
2010-05-17 10:00:21 +02:00
committed by Martin Schwidefsky
parent 57b28f6631
commit ab3c68ee5f
4 changed files with 33 additions and 42 deletions
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5
kernel/sysctl.c
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@@ -621,7 +621,7 @@ static struct ctl_table kern_table[] = {
#endif
{
.procname = "userprocess_debug",
.data = &sysctl_userprocess_debug,
.data = &show_unhandled_signals,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
@@ -1431,7 +1431,8 @@ static struct ctl_table fs_table[] = {
};
static struct ctl_table debug_table[] = {
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
defined(CONFIG_S390)
{
.procname = "exception-trace",
.data = &show_unhandled_signals,