| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 09/46] tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined | Date | Tue, 14 Jan 2020 11:01:26 +0100 |
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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)
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