Subject: Re: [PATCH v2 07/16] powerpc: Skip objtool from running on VDSO files

From: Michael Ellerman <[email-masked]>
Date: Fri, 02 Sep 2022 17:40:24 +1000

Peter Zijlstra <[email-masked]> writes:
> On Mon, Aug 29, 2022 at 11:22:14AM +0530, Sathvika Vasireddy wrote:
>> Do not run objtool on VDSO files, by using
>> OBJECT_FILES_NON_STANDARD
>> 
>> Suggested-by: Christophe Leroy <[email-masked]>
>> Signed-off-by: Sathvika Vasireddy <[email-masked]>
>> ---
>>  arch/powerpc/kernel/vdso/Makefile | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile
>> index 096b0bf1335f..a49a0d6a1c53 100644
>> --- a/arch/powerpc/kernel/vdso/Makefile
>> +++ b/arch/powerpc/kernel/vdso/Makefile
>> @@ -102,3 +102,5 @@ quiet_cmd_vdso64ld_and_check = VDSO64L $@
>>        cmd_vdso64ld_and_check = $(VDSOCC) $(c_flags) $(CC64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) ; $(cmd_vdso_check)
>>  quiet_cmd_vdso64as = VDSO64A $@
>>        cmd_vdso64as = $(VDSOCC) $(a_flags) $(CC64FLAGS) $(AS64FLAGS) -c -o $@ $<
>> +
>> +OBJECT_FILES_NON_STANDARD := y
>
> Just to clarify; your linker script will place the VDSO in .rodata or a
> similar !.text section, right?

Not the linker script, but we incbin it into .data.

See arch/powerpc/kernel/vdso64_wrapper.S

cheers