From e27c7fa015d61c8be6a2c32b2144aad2ae6ec975 Mon Sep 17 00:00:00 2001 From: Dustin Brown Date: Tue, 13 Jun 2017 11:40:56 -0700 Subject: [PATCH] arm64: Export save_stack_trace_tsk() The kernel watchdog is a great debugging tool for finding tasks that consume a disproportionate amount of CPU time in contiguous chunks. One can imagine building a similar watchdog for arbitrary driver threads using save_stack_trace_tsk() and print_stack_trace(). However, this is not viable for dynamically loaded driver modules on ARM platforms because save_stack_trace_tsk() is not exported for those architectures. Export save_stack_trace_tsk() for the ARM64 architecture to align with x86 and support various debugging use cases such as arbitrary driver thread watchdog timers. Signed-off-by: Dustin Brown Signed-off-by: Will Deacon --- arch/arm64/kernel/stacktrace.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index feac80c22f61..09d37d66b630 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -210,6 +210,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) put_task_stack(tsk); } +EXPORT_SYMBOL_GPL(save_stack_trace_tsk); void save_stack_trace(struct stack_trace *trace) { -- 2.20.1