kfn 37 arch/xtensa/include/asm/stacktrace.h int (*kfn)(struct stackframe *frame, void *data), kfn 116 arch/xtensa/kernel/stacktrace.c int (*kfn)(struct stackframe *frame, void *data), kfn 141 arch/xtensa/kernel/stacktrace.c if (kernel_text_address(pc) && kfn(&frame, data))