arch/tile: support signal "exception-trace" hook
This change adds support for /proc/sys/debug/exception-trace to tile.
Like x86 and sparc, by default it is set to "1", generating a one-line
printk whenever a user process crashes. By setting it to "2", we get
a much more complete userspace diagnostic at crash time, including
a user-space backtrace, register dump, and memory dump around the
address of the crash.
Some vestiges of the Tilera-internal version of this support are
removed with this patch (the show_crashinfo variable and the
arch_coredump_signal function). We retain a "crashinfo" boot parameter
which allows you to set the boot-time value of exception-trace.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c0bb324..aaec934 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1496,7 +1496,7 @@
static struct ctl_table debug_table[] = {
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
- defined(CONFIG_S390)
+ defined(CONFIG_S390) || defined(CONFIG_TILE)
{
.procname = "exception-trace",
.data = &show_unhandled_signals,
