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arm64: stacktrace: Factor out backtrace initialisation

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Some common code is required by each stacktrace user to initialise
struct stackframe before the first call to unwind_frame().

In preparation for adding to the common code, this patch factors it
out into a separate function start_backtrace(), and modifies the
stacktrace callers appropriately.

No functional change.

Signed-off-by: Dave Martin <dave.martin@arm.com>
[Mark: drop tsk argument, update more callsites]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Dave Martin
2019-07-02 14:07:28 +01:00
committed by Will Deacon
parent 8caa6e2be7
commit f3dcbe67ed
7 changed files with 30 additions and 42 deletions
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19
arch/arm64/kernel/stacktrace.c
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@@ -122,12 +122,7 @@ void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
data.skip = trace->skip;
data.no_sched_functions = 0;
frame.fp = regs->regs[29];
frame.pc = regs->pc;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = 0;
#endif
start_backtrace(&frame, regs->regs[29], regs->pc);
walk_stackframe(current, &frame, save_trace, &data);
}
EXPORT_SYMBOL_GPL(save_stack_trace_regs);
@@ -146,17 +141,15 @@ static noinline void __save_stack_trace(struct task_struct *tsk,
data.no_sched_functions = nosched;
if (tsk != current) {
frame.fp = thread_saved_fp(tsk);
frame.pc = thread_saved_pc(tsk);
start_backtrace(&frame, thread_saved_fp(tsk),
thread_saved_pc(tsk));
} else {
/* We don't want this function nor the caller */
data.skip += 2;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.pc = (unsigned long)__save_stack_trace;
start_backtrace(&frame,
(unsigned long)__builtin_frame_address(0),
(unsigned long)__save_stack_trace);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = 0;
#endif
walk_stackframe(tsk, &frame, save_trace, &data);