lkml.org 
[lkml]   [2010]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH -mm 0/8] unify dma_addr_t typedef (CONFIG_ARCH_DMA_ADDR_T_64BIT)
On Fri, 3 Sep 2010 09:51:31 +0900
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:

> There are about twenty architectures have the own dma_addr_t typedef
> because include/asm-generic/types.h can't be perfect (some of them can
> use it though):
>
> #ifndef dma_addr_t
> #ifdef CONFIG_PHYS_ADDR_T_64BIT
> typedef u64 dma_addr_t;
> #else
> typedef u32 dma_addr_t;
> #endif /* CONFIG_PHYS_ADDR_T_64BIT */
> #endif /* dma_addr_t */
>
> Another problem is that there is a way to determine if dma_addr_t is
> 64-bit. We see hopeless tricks like the following:
>
> #if (defined(__i386__) && defined(CONFIG_HIGHMEM64G)) || defined(__x86_64__) || defined (__ia64__) || defined(__alpha__) || defined(__mips64__) || (defined(__mips__) && defined(CONFIG_HIGHMEM) && defined(CONFIG_64BIT_PHYS_ADDR))
>
> This clean up the mess with introducing CONFIG_ARCH_DMA_ADDR_T_64BIT
> define (like CONFIG_ARCH_PHYS_ADDR_T_64BIT).
>
> If architecture needs 64bit dma_addr_t, it must enable
> CONFIG_ARCH_DMA_ADDR_T_64BIT.
>
> The summary are:
>
> - always 64bit
> -- alpha
> -- ia64
> -- tile
>
> - conditionally 64bit
> -- x86
> -- mips
> -- powerpc
> -- s390
>
> - always 32bit
> -- arm
> -- avr32
> -- cris
> -- frv
> -- h8300
> -- m32r
> -- m68k
> -- mn10300
> -- parisc
> -- xtensa
> -- sparc
> -- blackfin
> -- microblaze
> -- score
> -- sh

Am I correct in believing that we can merge the first seven patches
into arch trees at any time and, once they are all merged, patch 8/8
can then go into mainline?



\
 
 \ /
  Last update: 2010-09-04 00:13    [W:2.594 / U:0.596 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site