From e0115875c04548255212ebd7dbd90bdbe1257f48 Mon Sep 17 00:00:00 2001 From: Pratyush Anand Date: Fri, 29 Jan 2016 10:50:28 +0530 Subject: [PATCH] s390/stacktrace: add save_stack_trace_regs() Implement save_stack_trace_regs, so that a stack trace of a kprobe event can be obtained. Without this we see following warning: "save_stack_trace_regs() not implemented yet." when we execute: echo stacktrace > /sys/kernel/debug/tracing/trace_options echo "p kfree" >> /sys/kernel/debug/tracing/kprobe_events echo 1 > /sys/kernel/debug/tracing/events/kprobes/enable Reported-by: Chunyu Hu Signed-off-by: Pratyush Anand [heiko.carstens@de.ibm.com]: changed patch to use __save_stack_trace() Signed-off-by: Heiko Carstens Tested-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/stacktrace.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c index e0fec2d8ac40..8f64ebd63767 100644 --- a/arch/s390/kernel/stacktrace.c +++ b/arch/s390/kernel/stacktrace.c @@ -103,3 +103,14 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) trace->entries[trace->nr_entries++] = ULONG_MAX; } EXPORT_SYMBOL_GPL(save_stack_trace_tsk); + +void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) +{ + unsigned long sp; + + sp = kernel_stack_pointer(regs); + __save_stack_trace(trace, sp); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} +EXPORT_SYMBOL_GPL(save_stack_trace_regs); -- 2.20.1