linux-kernel - Re: [PATCH] asm-generic/io.h: remove asm/cacheflush.h include

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Date:	Mon, 29 Oct 2012 09:28:42 +0800 (CST)
From:	guanxuetao@...c.pku.edu.cn
To:	"James Hogan" <james.hogan@...tec.com>
Cc:	"Arnd Bergmann" <arnd@...db.de>, "Jonas Bonn" <jonas@...thpole.se>,
	linux-arch@...r.kernel.org, linux@...nrisc.net,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-xtensa@...ux-xtensa.org,
	"James Hogan" <james.hogan@...tec.com>,
	"Chris Zankel" <chris@...kel.net>,
	"Max Filippov" <jcmvbkbc@...il.com>,
	"Mike Frysinger" <vapier@...too.org>,
	"Chen Liqin" <liqin.chen@...plusct.com>,
	"Lennox Wu" <lennox.wu@...il.com>,
	"Guan Xuetao" <gxt@...c.pku.edu.cn>
Subject: Re: [PATCH] asm-generic/io.h: remove asm/cacheflush.h include

> Including <asm/cacheflush.h> from <asm-generic/io.h> prevents
> cacheflush.h being able to use I/O functions like readl and writel due
> to circular include dependencies. It doesn't appear as if anything from
> cacheflush.h is actually used by the generic io.h, so remove the
> include.
>
> I've compile tested a defconfig compilation of blackfin, openrisc (which
> needed <asm/pgtable.h> including from it's <asm/io.h> to get the PAGE_*
> definitions), and xtensa.
>
> Other architectures which use asm-generic/io.h are score and unicore32,
> and looking at their io.h I don't see any obvious problems.
>
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Jonas Bonn <jonas@...thpole.se>
> Cc: Chris Zankel <chris@...kel.net>
> Cc: Max Filippov <jcmvbkbc@...il.com>
> Cc: Mike Frysinger <vapier@...too.org>
> Cc: Chen Liqin <liqin.chen@...plusct.com>
> Cc: Lennox Wu <lennox.wu@...il.com>
> Cc: Guan Xuetao <gxt@...c.pku.edu.cn>

Acked-by: Guan Xuetao <gxt@...c.pku.edu.cn>

> ---
> Any compile testing of score and unicore32 anybody could provide would
> be great.
>
>  arch/openrisc/include/asm/io.h |    1 +
>  include/asm-generic/io.h       |    1 -
>  2 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/openrisc/include/asm/io.h
> b/arch/openrisc/include/asm/io.h
> index 07f5299..7c69139 100644
> --- a/arch/openrisc/include/asm/io.h
> +++ b/arch/openrisc/include/asm/io.h
> @@ -30,6 +30,7 @@
>  #define PIO_MASK		0
>
>  #include <asm-generic/io.h>
> +#include <asm/pgtable.h>
>
>  extern void __iomem *__ioremap(phys_addr_t offset, unsigned long size,
>  				pgprot_t prot);
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index 448303b..616eea5 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -12,7 +12,6 @@
>  #define __ASM_GENERIC_IO_H
>
>  #include <asm/page.h> /* I/O is all done through memory accesses */
> -#include <asm/cacheflush.h>
>  #include <linux/types.h>
>
>  #ifdef CONFIG_GENERIC_IOMAP
> --
> 1.7.7.6
>
>

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