evie/android_kernel_oneplus_msm8998
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arm/arm64: Export save_stack_trace_tsk()

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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: Dustin Brown <dustinb@codeaurora.org>
This commit is contained in:
Dustin Brown 2017-06-13 13:54:38 -07:00
parent c0f6993430
commit 86922e8007
2 changed files with 2 additions and 0 deletions
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1
arch/arm/kernel/stacktrace.c
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@ -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)
{

1
arch/arm64/kernel/stacktrace.c
View file

@ -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)
{