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Commit 86922e80 authored by Dustin Brown's avatar Dustin Brown
Browse files

arm/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.

Change-Id: I61e9d2afc4703a786fa6dcaf82fe46c0ed250045
CRs-Fixed: 2061326
Signed-off-by: default avatarDustin Brown <dustinb@codeaurora.org>
parent c0f69934

arch/arm/kernel/stacktrace.c

+1 −0
Original line number Diff line number Diff line
@@ -175,6 +175,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 
{

	__save_stack_trace(tsk, trace, 1);

}

EXPORT_SYMBOL(save_stack_trace_tsk);



void save_stack_trace(struct stack_trace *trace)

{

arch/arm64/kernel/stacktrace.c

+1 −0
Original line number Diff line number Diff line
@@ -184,6 +184,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 
	if (trace->nr_entries < trace->max_entries)

		trace->entries[trace->nr_entries++] = ULONG_MAX;

}

EXPORT_SYMBOL(save_stack_trace_tsk);



void save_stack_trace(struct stack_trace *trace)

{