linux-kernel - Re: [PATCH v2 06/29] nios2: I/O Mapping

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Message-ID: <6508070.FGfEk39Nmq@wuerfel>
Date:	Tue, 15 Jul 2014 11:22:54 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, lftan.linux@...il.com,
	cltang@...esourcery.com
Subject: Re: [PATCH v2 06/29] nios2: I/O Mapping

On Tuesday 15 July 2014 16:45:33 Ley Foon Tan wrote:
> +#ifdef __IO_USE_DUFFS
> +
> +/* Use "Duff's Device" to unroll the loops. */
> +#define __IO_OUT_LOOP(a, b, l)				\
> +	do {						\

The I/O loops can probably better go into the C file that uses them.

> +
> +/*
> + * PCI is not enabled in nios2. Provide dummy implementation to get 'allyesconfig'
> + * to build successfully.
> + */
> +#define inb(addr)	0
> +#define inw(addr)	0
> +#define inl(addr)	0
> +#define outb(x, addr)
> +#define outw(x, addr)
> +#define outl(x, addr)

These should either use inline functions or macros that behave like them,
to avoid miscompilation. The normal way to define those macros is

#define inb(a) ({ 0; })
#define outb(x, a) do { } while (0)

> +static inline void __iomem *ioremap_writethrough(unsigned long physaddr,
> +						unsigned long size)
> +{
> +	return __ioremap(physaddr, size, 0);
> +}

ioremap_writethrough() is not a standard interface, just drop it.

> +static inline void __iomem *ioremap_fullcache(unsigned long physaddr,
> +						unsigned long size)
> +{
> +	return __ioremap(physaddr, size, _PAGE_CACHED);
> +}

This is more commonly called ioremap_cache().

ioremap_fullcache() is defined on some architectures but never used. If
you don't use this in your own code, you can drop it as well.

	Arnd
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