linux-kernel - Re: [PATCH 05/16] powerpc: Skip objtool from running on drivers/crypto/vmx/aesp8-ppc.o

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Message-ID: <07a21891-1571-95ac-8afd-93ff1b92ef4b@linux.vnet.ibm.com>
Date:   Thu, 18 Aug 2022 16:42:11 +0530
From:   Sathvika Vasireddy <sv@...ux.vnet.ibm.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Cc:     "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "aik@...abs.ru" <aik@...abs.ru>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "npiggin@...il.com" <npiggin@...il.com>,
        "chenzhongjin@...wei.com" <chenzhongjin@...wei.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "naveen.n.rao@...ux.vnet.ibm.com" <naveen.n.rao@...ux.vnet.ibm.com>,
        Sathvika Vasireddy <sv@...ux.ibm.com>
Subject: Re: [PATCH 05/16] powerpc: Skip objtool from running on
 drivers/crypto/vmx/aesp8-ppc.o


On 10/08/22 14:04, Christophe Leroy wrote:
>
> Le 08/08/2022 à 13:48, Sathvika Vasireddy a écrit :
>> With objtool enabled, below warnings are seen when trying to build:
>>
>> drivers/crypto/vmx/aesp8-ppc.o: warning: objtool: aes_p8_set_encrypt_key+0x44: unannotated intra-function call
>>
>> drivers/crypto/vmx/aesp8-ppc.o: warning: objtool: .text+0x2448: unannotated intra-function call
>>
>> drivers/crypto/vmx/aesp8-ppc.o: warning: objtool: .text+0x2d68: unannotated intra-function call
>>
>> Skip objtool from running on this file, as
>> there are no calls to _mcount.
> Why not fix it the same way as for other files ? Please explain.
For two main reasons:

1. Since this file comes from OpenSSL, and since it is a perl file which 
generates a .S file,  it may not
     be the best choice to make too many code changes to such files, 
unless absolutely necessary.

2. Second reason is that, at least as far as the objtool --mcount 
functionality is concerned, we do not
     have to run objtool on that file because that file does not have 
any calls to _mcount.
>
>> Signed-off-by: Sathvika Vasireddy <sv@...ux.ibm.com>
>> ---
>>    drivers/crypto/vmx/Makefile | 2 ++
>>    1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/crypto/vmx/Makefile b/drivers/crypto/vmx/Makefile
>> index 2560cfea1dec..7b41f0da6807 100644
>> --- a/drivers/crypto/vmx/Makefile
>> +++ b/drivers/crypto/vmx/Makefile
>> @@ -9,3 +9,5 @@ targets += aesp8-ppc.S ghashp8-ppc.S
>>    
>>    $(obj)/aesp8-ppc.S $(obj)/ghashp8-ppc.S: $(obj)/%.S: $(src)/%.pl FORCE
>>    	$(call if_changed,perl)
>> +
>> +OBJECT_FILES_NON_STANDARD_aesp8-ppc.o := y