[PATCH] ia64: Add CONFIG_STACKTRACE_SUPPORT

Luck, Tony
2010-09-23T20:53:48Z

Several Linux features are dependent on stack trace support. Add
it so they can be enabled.

Signed-off-by: Tony Luck <tony.luck@intel.com>

---

commit 85718fae2a8d845e66762e6464152a255e323777
Author: Tony Luck <tony.luck@intel.com>
Date: Thu Sep 23 13:52:07 2010 -0700

[IA64] Add CONFIG_STACKTRACE_SUPPORT

Several Linux features are dependent on stack trace support. Add
it so they can be enabled.

Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index ba22849..e93f44e 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -62,6 +62,9 @@ config NEED_SG_DMA_LENGTH
config SWIOTLB
bool

+config STACKTRACE_SUPPORT
+ def_bool y
+
config GENERIC_LOCKBREAK
def_bool n

diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index db10b1e..395c2f2 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_AUDIT) += audit.o
obj-$(CONFIG_PCI_MSI) += msi_ia64.o
mca_recovery-y += mca_drv.o mca_drv_asm.o
obj-$(CONFIG_IA64_MC_ERR_INJECT)+= err_inject.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o

obj-$(CONFIG_PARAVIRT) += paravirt.o paravirtentry.o \
paravirt_patch.o
diff --git a/arch/ia64/kernel/stacktrace.c b/arch/ia64/kernel/stacktrace.c
new file mode 100644
index 0000000..5af2783
--- /dev/null
+++ b/arch/ia64/kernel/stacktrace.c
@@ -0,0 +1,39 @@
+/*
+ * arch/ia64/kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ */
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/module.h>
+
+static void
+ia64_do_save_stack(struct unw_frame_info *info, void *arg)
+{
+ struct stack_trace *trace = arg;
+ unsigned long ip;
+ int skip = trace->skip;
+
+ trace->nr_entries = 0;
+ do {
+ unw_get_ip(info, &ip);
+ if (ip = 0)
+ break;
+ if (skip = 0) {
+ trace->entries[trace->nr_entries++] = ip;
+ if (trace->nr_entries = trace->max_entries)
+ break;
+ } else
+ skip--;
+ } while (unw_unwind(info) >= 0);
+}
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+void save_stack_trace(struct stack_trace *trace)
+{
+ unw_init_running(ia64_do_save_stack, trace);
+}
+EXPORT_SYMBOL(save_stack_trace);