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Message-ID: <20070516095740.0f123058@gondolin.boeblingen.de.ibm.com>
Date: Wed, 16 May 2007 09:57:40 +0200
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Dan Williams <dan.j.williams@...el.com>,
NeilBrown <neilb@...e.de>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: 2.6.22-rc1-mm1 - s390 vs. md
On Tue, 15 May 2007 20:19:14 -0700,
Andrew Morton <akpm@...ux-foundation.org> wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc1/2.6.22-rc1-mm1/
Doesn't build on s390 when selecting the md menu:
drivers/built-in.o(.text+0x438ae): In function `async_xor':
: undefined reference to `dma_map_page'
drivers/built-in.o(.text+0x43aac): In function `async_xor':
: undefined reference to `dma_map_page'
drivers/built-in.o(.text+0x43d2e): In function `async_xor_zero_sum':
: undefined reference to `dma_map_page'
drivers/built-in.o(.text+0x43f50): In function `async_memcpy':
: undefined reference to `dma_map_page'
drivers/built-in.o(.text+0x43f90): In function `async_memcpy':
: undefined reference to `dma_map_page'
drivers/built-in.o(.text+0x4423e): more undefined references to
`dma_map_page' follow
This is caused by the following in drivers/md/Kconfig:
menuconfig MD
bool "Multiple devices driver support (RAID and LVM)"
depends on BLOCK
select ASYNC_TX_DMA
help
Support multiple physical spindles through a single logical device.
Required for RAID and logical volume management.
ASYNC_TX_DMA is defined in drivers/dma/Kconfig, which has
menu "DMA Engine support"
depends on !S390
but unfortunately ASYNC_TX_DMA depends neither on the menu nor
on !S390. (I think it was just an unknown symbol on s390 before
Martin's Kconfig rework, so I could build older -mm kernels.)
Currently, the only md stuff depending on ASYNC_TX_DMA is MD_RAID456
(which means it doesn't work on s390 anymore, which is bad enough).
With the select statement, no md stuff can be build on s390 at all (and
I really don't see why ASYNC_TX_DMA should be forced upon all md
users)...
-
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