linux-kernel - Re: [PATCH 1/3] sh: remove unused SLOW_DOWN

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Date:   Tue, 18 Oct 2022 12:30:10 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org
Subject: Re: [PATCH 1/3] sh: remove unused SLOW_DOWN_IO

On Thu, Oct 13, 2022 at 07:19:09PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> io.h defines SLOW_DOWN_IO only when CONF_SLOWDOWN_IO is defined, but
> CONF_SLOWDOWN_IO is never defined and is in fact explicitly undefined.
> Remove SLOW_DOWN_IO and related code.
> 
> N.B. 37b7a97884ba ("sh: machvec IO death.") went to some trouble to add
> CONF_SLOWDOWN_IO and SLOW_DOWN_IO, for no obvious reason.  Maybe there was
> some out-of-tree case that used this.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Rich Felker <dalias@...c.org>
> Cc: linux-sh@...r.kernel.org

Please disregard this patch.  I'll post an updated version that fixes
the build error and removes a little more unused/unnecessary stuff.

> ---
>  arch/sh/include/asm/io.h | 17 ++---------------
>  1 file changed, 2 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
> index fba90e670ed4..8d2df499b2fc 100644
> --- a/arch/sh/include/asm/io.h
> +++ b/arch/sh/include/asm/io.h
> @@ -121,11 +121,6 @@ __BUILD_MEMORY_STRING(__raw_, q, u64)
>  
>  #ifdef CONFIG_HAS_IOPORT_MAP
>  
> -/*
> - * Slowdown I/O port space accesses for antique hardware.
> - */
> -#undef CONF_SLOWDOWN_IO
> -
>  /*
>   * On SuperH I/O ports are memory mapped, so we access them using normal
>   * load/store instructions. sh_io_port_base is the virtual address to
> @@ -145,13 +140,7 @@ static inline void __set_io_port_base(unsigned long pbase)
>  extern void __iomem *__ioport_map(unsigned long addr, unsigned int size);
>  #endif
>  
> -#ifdef CONF_SLOWDOWN_IO
> -#define SLOW_DOWN_IO __raw_readw(sh_io_port_base)
> -#else
> -#define SLOW_DOWN_IO
> -#endif
> -
> -#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)			\
> +#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p)			\
>  									\
>  static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
>  {									\
> @@ -159,7 +148,6 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
>  									\
>  	__addr = __ioport_map(port, sizeof(type));			\
>  	*__addr = val;							\
> -	slow;								\
>  }									\
>  									\
>  static inline type pfx##in##bwlq##p(unsigned long port)			\
> @@ -169,14 +157,13 @@ static inline type pfx##in##bwlq##p(unsigned long port)			\
>  									\
>  	__addr = __ioport_map(port, sizeof(type));			\
>  	__val = *__addr;						\
> -	slow;								\
>  									\
>  	return __val;							\
>  }
>  
>  #define __BUILD_IOPORT_PFX(bus, bwlq, type)				\
>  	__BUILD_IOPORT_SINGLE(bus, bwlq, type, ,)			\
> -	__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
> +	__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p,)
>  
>  #define BUILDIO_IOPORT(bwlq, type)					\
>  	__BUILD_IOPORT_PFX(, bwlq, type)
> -- 
> 2.25.1
>