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

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Date:   Fri, 12 Feb 2021 12:56:18 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.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 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.

Anyway, thank you.

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

> ---
>  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