linux-kernel - Re: [PATCH] arch: x86: entry: vdso: fix type conversion on printf() call

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Date:   Tue, 15 Dec 2020 08:39:09 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] arch: x86: entry: vdso: fix type conversion on printf() call

On Tue, Dec 15, 2020 at 8:32 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 12/15/20 8:03 AM, Enrico Weigelt, metux IT consult wrote:
> > Fixing the following compiler warning by explicit conversion to long:
> >
> > In file included from /home/nekrad/src/apu2-dev/pkg/kernel.apu2.git/arch/x86/entry/vdso/vdso2c.c:162:0:
> > /home/nekrad/src/apu2-dev/pkg/kernel.apu2.git/arch/x86/entry/vdso/vdso2c.h: In function 'extract64':
> > /home/nekrad/src/apu2-dev/pkg/kernel.apu2.git/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=]
> >   fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
> >                                                     ^
> >   CC      mm/filemap.o
> > In file included from /home/nekrad/src/apu2-dev/pkg/kernel.apu2.git/arch/x86/entry/vdso/vdso2c.c:166:0:
> > /home/nekrad/src/apu2-dev/pkg/kernel.apu2.git/arch/x86/entry/vdso/vdso2c.h: In function 'extract32':
> > /home/nekrad/src/apu2-dev/pkg/kernel.apu2.git/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=]
> >   fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
> >
> > Signed-off-by: Enrico Weigelt, metux IT consult <info@...ux.net>
> > ---
> >  arch/x86/entry/vdso/vdso2c.h | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
>
> Hi,
>
> size_t is normally printed with %zu.
> Is there some reason that isn't being used here?

No.  Want to send a patch?