On Fri, Oct 22, 2021 at 05:09:36PM +0200, Peter Zijlstra wrote:

From: Ard Biesheuvel <ardb@kernel.org>

Implement the flavor of CONFIG_STACKTRACE that relies mostly on generic
code, and only need a small arch_stack_walk() helper that performs the
actual frame unwinding.

Note that this removes the SMP check that used to live in
__save_stack_trace(), but this is no longer needed now that the generic
version of save_stack_trace_tsk() takes care not to walk the call stack
of tasks that are live on other CPUs.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

Reviewed-by: Kees Cook <redacted>

-- 
Kees Cook