From: Steven Rostedt (VMware) rostedt@goodmis.org
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: 4df297129f622 ("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
--- kernel/trace/trace_stack.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -196,6 +196,11 @@ check_stack(unsigned long ip, unsigned l 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)