netdev - Re: [PATCH] starfire: use BUILD_BUG_ON for netdrv_addr

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Date:	Sat, 28 Aug 2010 15:41:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akinobu.mita@...il.com
Cc:	netdev@...r.kernel.org, ionut@...ula.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH] starfire: use BUILD_BUG_ON for netdrv_addr_t

From: Akinobu Mita <akinobu.mita@...il.com>
Date: Sat, 28 Aug 2010 14:08:45 +0900

> Detect size mismatch for netdrv_addr_t at build time rather than
> checking at module load time.
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> Cc: Ion Badulescu <ionut@...ula.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: netdev@...r.kernel.org

Applied, but I suspect we will see some interesting build failures now
if that ugly and brittle ifdef test which constrols the netdrv_addr_t
define isn't %100 accurate.

Fujita-san, what this driver does is actually pretty reasonable.  It
has two kinds of descriptors, one supports 32-bit addresses and the
other supports 64-bit addresses.  It wants to CPP test which one to
use so that the driver is not burdoned with two duplicated sets of
routines.

Maybe we should provide a DMA_ADDR_T_SIZE or similar macro?  What do
you think?  Anything is better than what it uses now:

/*
 * This SUCKS.
 * We need a much better method to determine if dma_addr_t is 64-bit.
 */
#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))

:-)

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