linux-kernel - Re: [RFC PATCH 2/4] objtool: Enable objtool to run only on files with ftrace enabled

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Date:   Tue, 24 May 2022 08:57:55 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Sathvika Vasireddy <sv@...ux.ibm.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mbenes@...e.cz" <mbenes@...e.cz>, "aik@...abs.ru" <aik@...abs.ru>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "naveen.n.rao@...ux.vnet.ibm.com" <naveen.n.rao@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 2/4] objtool: Enable objtool to run only on files with
 ftrace enabled



Le 23/05/2022 à 19:55, Sathvika Vasireddy a écrit :
> This patch makes sure objtool runs only on the object files
> that have ftrace enabled, instead of running on all the object
> files.

Why do that ?

What about static_calls ? There may be files without ftrace but with 
static calls.

By the way, it would be nice if we could use it only on C files.
I get the following errors for ASM files:

arch/powerpc/kernel/entry_32.o: warning: objtool: .text+0x1b4: 
unannotated intra-function call

> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> Signed-off-by: Sathvika Vasireddy <sv@...ux.ibm.com>
> ---
>   scripts/Makefile.build | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 2e0c3f9c1459..06ceffd92921 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -258,8 +258,8 @@ else
>   # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
>   # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
>   
> -$(obj)/%.o: objtool-enabled = $(if $(filter-out y%, \
> -	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y)
> +$(obj)/%.o: objtool-enabled = $(and $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y),        \
> +        $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)),y),y)
>   
>   endif
>