linux-kernel - Re: [PATCH] arch: m68k: include: asm: the 3rd parameter of 'insl' and 'outsl' need '<< 2'

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Date:	Thu, 30 May 2013 20:52:31 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Greg Ungerer <gerg@...inux.org>, schmitz@...ian.org,
	Sam Ravnborg <sam@...nborg.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] arch: m68k: include: asm: the 3rd parameter of 'insl' and
 'outsl' need '<< 2'

On Thu, May 30, 2013 at 11:39 AM, Chen Gang <gang.chen@...anux.com> wrote:
> According to the original implementation in 2009, 'insl' and 'outsl'
> need '<< 2'.

Sorry, now I'm confused. Which original implementation?
I can't find this one using "<< 2"?

> Also add '#ifdef' to avoid multiple defination, and beautify code to
> pass "./scripts/checkpatch.pl"
>
> The related git number:
>   for parport.h: "4914802 m68k,m68knommu: merge header files" in 2009
>   for io_mm.h: "84b16b7 m68k/atari: ROM port ISA adapter support" in Apr 6 2013
>
> The related warning (make EXTRA_CFLAG=-W ARCH=m68k allmodconfig):
>   arch/m68k/include/asm/parport.h:14:0: warning: "insl" redefined [enabled by default]
>   arch/m68k/include/asm/io_mm.h:403:0: note: this is the location of the previous definition
>   arch/m68k/include/asm/parport.h:15:0: warning: "outsl" redefined [enabled by default]
>   arch/m68k/include/asm/io_mm.h:406:0: note: this is the location of the previous definition
>
>
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  arch/m68k/include/asm/io_mm.h   |    5 +++--
>  arch/m68k/include/asm/parport.h |    9 +++++++--
>  2 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
> index ffdf54f4..66be3b2 100644
> --- a/arch/m68k/include/asm/io_mm.h
> +++ b/arch/m68k/include/asm/io_mm.h
> @@ -400,10 +400,11 @@ static inline void isa_delay(void)
>
>  #define insb(port, buf, nr)    ((port) < 1024 ? isa_rom_insb((port), (buf), (nr)) : isa_insb((port), (buf), (nr)))
>  #define insw(port, buf, nr)    ((port) < 1024 ? isa_rom_insw((port), (buf), (nr)) : isa_insw((port), (buf), (nr)))
> -#define insl                   isa_insl
> +#define insl(port, buf, len)   isa_insb((port), (buf), (len) << 2)

Oops, changes from 32-bit accesses to byte accesses?

>  #define outsb(port, buf, nr)   ((port) < 1024 ? isa_rom_outsb((port), (buf), (nr)) : isa_outsb((port), (buf), (nr)))
>  #define outsw(port, buf, nr)   ((port) < 1024 ? isa_rom_outsw((port), (buf), (nr)) : isa_outsw((port), (buf), (nr)))
> -#define outsl                  isa_outsl
> +#define outsl(port, buf, len)  isa_outsb((port), (buf), (len) << 2)
>
>  #define readb(addr)            in_8(addr)
>  #define writeb(val, addr)      out_8((addr), (val))
> diff --git a/arch/m68k/include/asm/parport.h b/arch/m68k/include/asm/parport.h
> index 5ea75e6..e8e4a2a 100644
> --- a/arch/m68k/include/asm/parport.h
> +++ b/arch/m68k/include/asm/parport.h
> @@ -11,8 +11,13 @@
>  #ifndef _ASM_M68K_PARPORT_H
>  #define _ASM_M68K_PARPORT_H 1
>
> -#define insl(port,buf,len)   isa_insb(port,buf,(len)<<2)
> -#define outsl(port,buf,len)  isa_outsb(port,buf,(len)<<2)
> +#ifndef insl
> +#define insl(port, buf, len)   isa_insb((port), (buf), (len) << 2)
> +#endif
> +
> +#ifndef outsl
> +#define outsl(port, buf, len)  isa_outsb((port), (buf), (len) << 2)
> +#endif

Now the (re)definitions are identical to the originals, so they can just
be removed. But the ones in <asm/io.h> are not correct anymore, IMHO.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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