linux-kernel - what is the purpose of "CONFIG_DMA_IS

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Date:	Mon, 27 Nov 2006 13:25:34 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: what is the purpose of "CONFIG_DMA_IS_DMA32"?

  perhaps a silly question, but:

$ grep -r "DMA_IS_DMA32" *
arch/ia64/defconfig:CONFIG_DMA_IS_DMA32=y
arch/ia64/configs/sim_defconfig:CONFIG_DMA_IS_DMA32=y
arch/ia64/configs/zx1_defconfig:CONFIG_DMA_IS_DMA32=y
arch/ia64/configs/tiger_defconfig:CONFIG_DMA_IS_DMA32=y
arch/ia64/configs/bigsur_defconfig:CONFIG_DMA_IS_DMA32=y
arch/ia64/configs/gensparse_defconfig:CONFIG_DMA_IS_DMA32=y
$

what is the purpose of a configuration symbol that is set but never
involved in a conditional check?

  i'm guessing that used to be a config setting in the ia64/Kconfig
file that has since vanished.

rday
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