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From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: aik@ozlabs.ru, chenzhongjin@huawei.com, npiggin@gmail.com,
	linux-kernel@vger.kernel.org, peterz@infradead.org,
	mingo@redhat.com, rostedt@goodmis.org, jpoimboe@redhat.com,
	Sathvika Vasireddy <sv@linux.ibm.com>,
	mbenes@suse.cz, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v4 11/16] objtool: Add --mnop as an option to --mcount
Date: Wed, 12 Oct 2022 19:17:29 +0530	[thread overview]
Message-ID: <1665582234.mk6z7nug7r.naveen@linux.ibm.com> (raw)
In-Reply-To: <20221011203332.zzmv6awd5eiydxgw@treble>

Josh Poimboeuf wrote:
> On Mon, Oct 10, 2022 at 05:07:46PM +0530, Naveen N. Rao wrote:
>> > +++ b/scripts/Makefile.lib
>> > @@ -234,6 +234,7 @@ objtool_args =								\
>> >  	$(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr)		\
>> >  	$(if $(CONFIG_X86_KERNEL_IBT), --ibt)				\
>> >  	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
>> > +	$(if $(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT), --mnop)                 \
>> 
>> This still won't help: for instance, if CONFIG_FTRACE itself is disabled. I
>> think we should make this depend on CONFIG_FTRACE_MCOUNT_USE_OBJTOOL. The
>> below change works for me:
>> 
>> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
>> index 54d2d6451bdacc..fd3f55a1fdb7bb 100644
>> --- a/scripts/Makefile.lib
>> +++ b/scripts/Makefile.lib
>> @@ -245,8 +245,8 @@ objtool_args =                                                              \
>>        $(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label)        \
>>        $(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr)              \
>>        $(if $(CONFIG_X86_KERNEL_IBT), --ibt)                           \
>> -       $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)             \
>> -       $(if $(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT), --mnop)                 \
>> +        $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL),                       \
>> +             $(if $(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT), --mcount --mnop, --mcount)) \
>>        $(if $(CONFIG_UNWINDER_ORC), --orc)                             \
>>        $(if $(CONFIG_RETPOLINE), --retpoline)                          \
>>        $(if $(CONFIG_RETHUNK), --rethunk)                              \
> 
> This has a new conflict, may need something like:
> 
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -256,6 +256,9 @@ objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK)		+= --hacks=jump_label
>  objtool-args-$(CONFIG_HAVE_NOINSTR_HACK)		+= --hacks=noinstr
>  objtool-args-$(CONFIG_X86_KERNEL_IBT)			+= --ibt
>  objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL)	+= --mcount
> +ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
> +objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT)		+= --mnop
> +endif
>  objtool-args-$(CONFIG_UNWINDER_ORC)			+= --orc
>  objtool-args-$(CONFIG_RETPOLINE)			+= --retpoline
>  objtool-args-$(CONFIG_RETHUNK)				+= --rethunk

Thanks. That's definitely simpler.

I haven't checked if there are any other conflicts with 
tip/objtool/core though. Not sure how to proceed here.


- Naveen

  reply	other threads:[~2022-10-12 13:48 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-02 10:42 [PATCH v4 00/16] objtool: Enable and implement --mcount option on powerpc Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 01/16] powerpc: Fix __WARN_FLAGS() for use with Objtool Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 02/16] powerpc: Override __ALIGN and __ALIGN_STR macros Sathvika Vasireddy
2022-10-02 17:41   ` Christophe Leroy
2022-10-02 10:42 ` [PATCH v4 03/16] powerpc: Fix objtool unannotated intra-function call warnings Sathvika Vasireddy
2022-10-10 11:34   ` Naveen N. Rao
2022-10-02 10:42 ` [PATCH v4 04/16] powerpc: Curb objtool unannotated intra-function warnings Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 05/16] powerpc: Skip objtool from running on drivers/crypto/vmx/aesp8-ppc.o Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 06/16] powerpc: Fix objtool unannotated intra-function call warnings on PPC32 Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 07/16] powerpc: Skip objtool from running on VDSO files Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 08/16] objtool: Fix SEGFAULT Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 09/16] objtool: Use target file endianness instead of a compiled constant Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 10/16] objtool: Use target file class size " Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 11/16] objtool: Add --mnop as an option to --mcount Sathvika Vasireddy
2022-10-02 17:40   ` Christophe Leroy
2022-10-10 11:37   ` Naveen N. Rao
2022-10-11 20:33     ` Josh Poimboeuf
2022-10-12 13:47       ` Naveen N. Rao [this message]
2022-10-02 10:42 ` [PATCH v4 12/16] objtool: Read special sections with alts only when specific options are selected Sathvika Vasireddy
2022-10-02 17:42   ` Christophe Leroy
2022-10-02 10:42 ` [PATCH v4 13/16] objtool: Use macros to define arch specific reloc types Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 14/16] objtool: Add arch specific function arch_ftrace_match() Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 15/16] objtool/powerpc: Enable objtool to be built on ppc Sathvika Vasireddy
2022-10-02 10:42 ` [PATCH v4 16/16] objtool/powerpc: Add --mcount specific implementation Sathvika Vasireddy
2022-10-02 17:42   ` Christophe Leroy
2022-10-10 11:49 ` [PATCH v4 00/16] objtool: Enable and implement --mcount option on powerpc Naveen N. Rao
     [not found]   ` <notmuch-sha1-66fb111b87471c685a53b80a0502d959f90d07a7>
2022-10-13  0:05     ` Josh Poimboeuf
2022-10-13  3:40       ` Naveen N. Rao

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