linux-kernel - Re: [PATCH] x86: vdso: fix printf() format warnings in vdso2c.h

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Date:   Fri, 12 Feb 2021 13:20:47 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Borislav Petkov <bp@...e.de>, x86@...nel.org
Subject: Re: [PATCH] x86: vdso: fix printf() format warnings in vdso2c.h

On 2/12/21 2:56 AM, Jarkko Sakkinen wrote:
> On Mon, Feb 08, 2021 at 05:23:05PM -0800, Randy Dunlap wrote:
>> Use %zu instead of %lu for size_t to prevent w printf()
>> format warnings in vdso2c.h
>>
>>   HOSTCC  arch/x86/entry/vdso/vdso2c
>> In file included from ../arch/x86/entry/vdso/vdso2c.c:162:
>> ../arch/x86/entry/vdso/vdso2c.h: In function 'extract64':
>> ../arch/x86/entry/vdso/vdso2c.h:38:52: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
>>    38 |  fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
>>       |                                                  ~~^              ~~~
>> In file included from ../arch/x86/entry/vdso/vdso2c.c:166:
>> ../arch/x86/entry/vdso/vdso2c.h: In function 'extract32':
>> ../arch/x86/entry/vdso/vdso2c.h:38:52: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
>>    38 |  fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
>>       |                                                  ~~^              ~~~
>>
>> Fixes: 8382c668ce4f ("x86/vdso: Add support for exception fixup in vDSO functions")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Sean Christopherson <seanjc@...gle.com>
>> Cc: Jarkko Sakkinen <jarkko@...nel.org>
>> Cc: Borislav Petkov <bp@...e.de>
>> Cc: x86@...nel.org
> 
> Just a *question*: should SOB be the last? Seeing this 2nd time today, and
> just not used to it. That's why asking.

I'll have to let someone else answer that. AFAICT, it's not documented.

I have read (in email) that when adding Acked-by, Tested-by, Reviewed-by, etc.,
that those should be added at the end of the list in chronological
order, but that doesn't tell us where to put the Cc: list.


> Anyway, thank you.
> 
> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

Thanks. Added at the end of the list. :)


>> ---
>>  arch/x86/entry/vdso/vdso2c.h |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> --- lnx-511-rc7.orig/arch/x86/entry/vdso/vdso2c.h
>> +++ lnx-511-rc7/arch/x86/entry/vdso/vdso2c.h
>> @@ -35,7 +35,7 @@ static void BITSFUNC(extract)(const unsi
>>  	if (offset + len > data_len)
>>  		fail("section to extract overruns input data");
>>  
>> -	fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
>> +	fprintf(outfile, "static const unsigned char %s[%zu] = {", name, len);
>>  	BITSFUNC(copy)(outfile, data + offset, len);
>>  	fprintf(outfile, "\n};\n\n");
>>  }
>>
> 
> /Jarkko
> 


-- 
~Randy