Commit c9190965 authored Jan 02, 2020 by Steven Rostedt (VMware) Committed by Greg Kroah-Hartman Jan 14, 2020

tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined

commit b8299d362d0837ae39e87e9019ebe6b736e0f035 upstream.

On some archs with some configurations, MCOUNT_INSN_SIZE is not defined, and
this makes the stack tracer fail to compile. Just define it to zero in this
case.

Link: https://lore.kernel.org/r/202001020219.zvE3vsty%lkp@intel.com



Cc: stable@vger.kernel.org
Fixes: 4df29712 ("tracing: Remove most or all of stack tracer stack size from stack_max_size")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 5ab4bb7b

kernel/trace/trace_stack.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -196,6 +196,11 @@ check_stack(unsigned long ip, unsigned long *stack)
		local_irq_restore(flags);
		}

		/* Some archs may not define MCOUNT_INSN_SIZE */
		#ifndef MCOUNT_INSN_SIZE
		# define MCOUNT_INSN_SIZE 0
		#endif

		static void
		stack_trace_call(unsigned long ip, unsigned long parent_ip,
		struct ftrace_ops op, struct pt_regs pt_regs)