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The ret_stack (shadow stack used by function graph infrastructure) is currently defined as PAGE_SIZE. But some architectures which have 64K PAGE_SIZE, this is way overkill. Also there's an effort to allow the PAGE_SIZE to be defined at boot up. Hard code it for now to 4096. In the future, this size may change and even be dependent on specific architectures. Link: https://lore.kernel.org/all/e5067bb8-0fcd-4739-9bca-0e872037d5a1@arm.com/ Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://lore.kernel.org/20241019152951.053f9646@rorschach.local.home Suggested-by: Ryan Roberts <ryan.roberts@arm.com> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>