linux-kernel - Re: [RFC PATCH 13/18] ARM: LPAE: ensure dma_addr_t is the same size as phys_addr

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Date:	Mon, 25 Oct 2010 21:01:47 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	catalin.marinas@....com
Cc:	arnd@...db.de, fujita.tomonori@....ntt.co.jp,
	linux-arm-kernel@...ts.infradead.org, Will.Deacon@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 13/18] ARM: LPAE: ensure dma_addr_t is the same
 size as phys_addr_t

On Mon, 25 Oct 2010 12:32:09 +0100
Catalin Marinas <catalin.marinas@....com> wrote:

> On Mon, 2010-10-25 at 12:08 +0100, Arnd Bergmann wrote:
> > On Monday 25 October 2010, Catalin Marinas wrote:
> > > From: Will Deacon <will.deacon@....com>
> > >
> > > Now that phys_addr_t can be 64-bit on ARM, we must ensure that dma_addr_t
> > > is sufficiently large to hold physical addresses.
> > >
> > > This patch uses the types.h implementation in asm-generic to define the
> > > dma_addr_t type as the same width as phys_addr_t.
> > >
> > > Signed-off-by: Will Deacon <will.deacon@....com>
> > > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> > 
> > This patch will become obsolete once the "unify dma_addr_t typedef"
> > series from Fujita Tomonori is upstream, you will instead have to set
> > CONFIG_ARCH_DMA_ADDR_T_64BIT.
> 
> Yes, I know this and it's on my list to fix once I update the patches to
> 2.6.37-rc1.

This patch also conflicts with the patchset removing dma64_addr_t (you
really don't need dma64_addr_t):

http://marc.info/?l=linux-arch&m=128685377524976&w=2

Both in -mm and I think Andrew will merge both
CONFIG_ARCH_DMA_ADDR_T_64BIT and dma64_addr_t patchset.

So how about dropping this patch and folding the following into your
18th patch. Then Andrew will not get the conflict and -rc1 works fine
for you.

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index f2205e7..0a01b7b 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -617,6 +617,9 @@ config ARM_LPAE
 config ARCH_PHYS_ADDR_T_64BIT
 	def_bool ARM_LPAE
 
+config ARCH_DMA_ADDR_T_64BIT
+	def_bool ARM_LPAE
+
 config ARM_THUMB
 	bool "Support Thumb user binaries"
 	depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V7 || CPU_FEROCEON




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