arm64: stacktrace: Factor out backtrace initialisation

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 <[email protected]>
[Mark: drop tsk argument, update more callsites]
Signed-off-by: Mark Rutland <[email protected]>
Reviewed-by: James Morse <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

0 files changed, 0 insertions, 0 deletions