| From b8299d362d0837ae39e87e9019ebe6b736e0f035 Mon Sep 17 00:00:00 2001 |
| From: "Steven Rostedt (VMware)" <rostedt@goodmis.org> |
| Date: Thu, 2 Jan 2020 22:02:41 -0500 |
| Subject: tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined |
| |
| 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 |
| @@ -180,6 +180,11 @@ 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) |
