linux-kernel - Re: Removing __kernel_old_uid_t, git_t, dev

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Date:	Mon, 30 Mar 2009 16:41:27 +0200
From:	Geert Uytterhoeven <geert.uytterhoeven@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	michal.simek@...alogix.com,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: Removing __kernel_old_uid_t, git_t, dev_t

On Mon, Mar 30, 2009 at 15:58, Arnd Bergmann <arnd@...db.de> wrote:
> diff --git a/include/asm-generic/types.h b/include/asm-generic/types.h
> new file mode 100644
> index 0000000..5841716
> --- /dev/null
> +++ b/include/asm-generic/types.h
> @@ -0,0 +1,56 @@
> +#ifndef __ASM_GENERIC_TYPES_H
> +#define __ASM_GENERIC_TYPES_H
> +
> +/*
> + * int-ll64 is used on all 32 bit architectures and on x86-64,
> + * so use it as a reasonable default.
> + */
> +#include <asm-generic/int-ll64.h>
> +

Most 64-bit archs have been migrated to ll64 by now.
Alpha, ia64, and mips64 are the remaining exceptions.

> +/*
> + * DMA addresses may be larger than pointers, but not smaller.
> + * Do not define the dma64_addr_t type, which never really
> + * worked.
> + */
> +#if defined(CONFIG_64BIT) || defined(CONFIG_PHYS_64BIT)
> +typedef u64 dma_addr_t;
> +#else
> +typedef u32 dma_addr_t;
> +#endif /* 64 bit DMA pointer */

Is there any specific reason why dma_addr_t is in <asm/types.h>, while
phys_addr_t is in
<linux/types.h>?

Furthermore, CONFIG_PHYS_64BIT is used on PPC only. Probably it should be
replaced by CONFIG_PHYS_ADDR_T_64BIT, which is always set if CONFIG_64BIT,
so the #ifdef above becomes even simpler?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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