linux-kernel - Re: [PATCH 1/2] add phys_addr_t for holding physical addresses

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Message-Id: <1218491896.8041.9.camel@pasglop>
Date:	Tue, 12 Aug 2008 07:58:16 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, ehabkost@...hat.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/2] add phys_addr_t for holding physical addresses

On Mon, 2008-08-11 at 12:38 -0700, Jeremy Fitzhardinge wrote:
> Add a kernel-wide "phys_addr_t" which is guaranteed to be able to hold
> any physical address.  By default it equals the word size of the
> architecture, but a 32-bit architecture can set ARCH_PHYS_ADDR_T_64BIT
> if it needs a 64-bit phys_addr_t.

I've been wondering for some time why can't we make phys_addr_t and
resource_size_t the same thing... I don't like having two ARCH_* thing
especially since I believe the one for resources is already what we
want.

Ben.

> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> diff -r 4909b40dbdc5 arch/powerpc/Kconfig
> --- a/arch/powerpc/Kconfig	Fri Aug 08 13:40:52 2008 -0700
> +++ b/arch/powerpc/Kconfig	Mon Aug 11 10:32:52 2008 -0700
> @@ -21,6 +21,9 @@
>  
>  config PPC_MERGE
>  	def_bool y
> +
> +config ARCH_PHYS_ADDR_T_64BIT
> +       def_bool PPC64 || PHYS_64BIT
>  
>  config MMU
>  	bool
> diff -r 4909b40dbdc5 arch/x86/Kconfig
> --- a/arch/x86/Kconfig	Fri Aug 08 13:40:52 2008 -0700
> +++ b/arch/x86/Kconfig	Mon Aug 11 10:32:53 2008 -0700
> @@ -1002,6 +1002,9 @@
>  	  has the cost of more pagetable lookup overhead, and also
>  	  consumes more pagetable space per process.
>  
> +config ARCH_PHYS_ADDR_T_64BIT
> +       def_bool X86_64 || X86_PAE
> +
>  # Common NUMA Features
>  config NUMA
>  	bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
> diff -r 4909b40dbdc5 include/asm-powerpc/types.h
> --- a/include/asm-powerpc/types.h	Fri Aug 08 13:40:52 2008 -0700
> +++ b/include/asm-powerpc/types.h	Mon Aug 11 10:32:53 2008 -0700
> @@ -48,13 +48,6 @@
>  
>  typedef __vector128 vector128;
>  
> -/* Physical address used by some IO functions */
> -#if defined(CONFIG_PPC64) || defined(CONFIG_PHYS_64BIT)
> -typedef u64 phys_addr_t;
> -#else
> -typedef u32 phys_addr_t;
> -#endif
> -
>  #ifdef __powerpc64__
>  typedef u64 dma_addr_t;
>  #else
> diff -r 4909b40dbdc5 include/asm-x86/page_32.h
> --- a/include/asm-x86/page_32.h	Fri Aug 08 13:40:52 2008 -0700
> +++ b/include/asm-x86/page_32.h	Mon Aug 11 10:32:53 2008 -0700
> @@ -33,7 +33,6 @@
>  typedef u64	pudval_t;
>  typedef u64	pgdval_t;
>  typedef u64	pgprotval_t;
> -typedef u64	phys_addr_t;
>  
>  typedef union {
>  	struct {
> @@ -54,7 +53,6 @@
>  typedef unsigned long	pudval_t;
>  typedef unsigned long	pgdval_t;
>  typedef unsigned long	pgprotval_t;
> -typedef unsigned long	phys_addr_t;
>  
>  typedef union {
>  	pteval_t pte;
> diff -r 4909b40dbdc5 include/asm-x86/page_64.h
> --- a/include/asm-x86/page_64.h	Fri Aug 08 13:40:52 2008 -0700
> +++ b/include/asm-x86/page_64.h	Mon Aug 11 10:32:53 2008 -0700
> @@ -79,7 +79,6 @@
>  typedef unsigned long	pudval_t;
>  typedef unsigned long	pgdval_t;
>  typedef unsigned long	pgprotval_t;
> -typedef unsigned long	phys_addr_t;
>  
>  typedef struct page *pgtable_t;
>  
> diff -r 4909b40dbdc5 include/linux/types.h
> --- a/include/linux/types.h	Fri Aug 08 13:40:52 2008 -0700
> +++ b/include/linux/types.h	Mon Aug 11 10:32:53 2008 -0700
> @@ -197,6 +197,12 @@
>  typedef u32 resource_size_t;
>  #endif
>  
> +#ifdef CONFIG_PHYS_ADDR_T_64BIT
> +typedef u64 phys_addr_t;
> +#else
> +typedef u32 phys_addr_t;
> +#endif
> +
>  struct ustat {
>  	__kernel_daddr_t	f_tfree;
>  	__kernel_ino_t		f_tinode;
> diff -r 4909b40dbdc5 mm/Kconfig
> --- a/mm/Kconfig	Fri Aug 08 13:40:52 2008 -0700
> +++ b/mm/Kconfig	Mon Aug 11 10:32:53 2008 -0700
> @@ -190,6 +190,9 @@
>  	help
>  	  This option allows memory and IO resources to be 64 bit.
>  
> +config PHYS_ADDR_T_64BIT
> +	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
> +
>  config ZONE_DMA_FLAG
>  	int
>  	default "0" if !ZONE_DMA
> 

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