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author | Tony Luck <tony.luck@intel.com> | 2010-09-23 20:52:07 (GMT) |
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committer | Tony Luck <tony.luck@intel.com> | 2010-09-23 20:52:07 (GMT) |
commit | 85718fae2a8d845e66762e6464152a255e323777 (patch) | |
tree | e06745ac70e457517bf14a8b7f71e026989612b5 /arch/ia64/kernel/stacktrace.c | |
parent | 57aebd7739c8dbbf403876ee1e9673fafc83d856 (diff) | |
download | linux-fsl-qoriq-85718fae2a8d845e66762e6464152a255e323777.tar.xz |
[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>
Diffstat (limited to 'arch/ia64/kernel/stacktrace.c')
-rw-r--r-- | arch/ia64/kernel/stacktrace.c | 39 |
1 files changed, 39 insertions, 0 deletions
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); |