On Wed, Jun 20, 2018 at 10:47 PM Tetsuo Handa
<penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
>
> From 7208bf13827fa7c7d6196ee20f7678eff0d29b36 Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Date: Thu, 21 Jun 2018 14:15:10 +0900
> Subject: [PATCH] Makefile: Fix backtrace breakage
>
> Dave Chinner noticed that backtrace part is missing in a lockdep report.
>
> [ 68.760085] the existing dependency chain (in reverse order) is:
> [ 69.258520]
> [ 69.258520] -> #1 (fs_reclaim){+.+.}:
> [ 69.623516]
> [ 69.623516] -> #0 (sb_internal){.+.+}:
> [ 70.152322]
> [ 70.152322] other info that might help us debug this:
>
> Since the kernel was using CONFIG_FTRACE_MCOUNT_RECORD=n &&
> CONFIG_FRAME_POINTER=n, objtool_args was not properly calculated
> due to incorrectly placed "endif" in commit 96f60dfa5819a065 ("trace:
> Use -mcount-record for dynamic ftrace").
>
> Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Cc: Dave Chinner <david@xxxxxxxxxxxxx>
> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
This looks similar to https://lkml.org/lkml/2018/6/8/545
> ---
> scripts/Makefile.build | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 34d9e9c..55f22f4 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -239,6 +239,7 @@ cmd_record_mcount = \
> "$(CC_FLAGS_FTRACE)" ]; then \
> $(sub_cmd_record_mcount) \
> fi;
> +endif
> endif # CONFIG_FTRACE_MCOUNT_RECORD
>
> ifdef CONFIG_STACK_VALIDATION
> @@ -263,7 +264,6 @@ ifneq ($(RETPOLINE_CFLAGS),)
> objtool_args += --retpoline
> endif
> endif
> -endif
>
>
> ifdef CONFIG_MODVERSIONS
> --
> 1.8.3.1
>
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