On Mon, Sep 18, 2006 at 02:55:59PM +0100, Christoph Hellwig wrote: > On Mon, Sep 11, 2006 at 03:27:39PM -0700, Christoph Lameter wrote: > > Second, arches may use ZONE_DMA in an unknown way. We set CONFIG_ZONE_DMA > > for all arches that do not set CONFIG_GENERIC_ISA_DMA in order to insure > > backwards compatibility. The arches may later undefine ZONE_DMA > > if their arch code has been verified to not depend on ZONE_DMA. > > Let's pass this on to linux-arch so that the arch maintainers can give input > whether they need ZONE_DMA or not. If this just sneaks in unseen I'd bet > various architectures will just keept it around despite not needing it. > sh and sh64 have no use for ZONE_DMA, it's effectively ZONE_DMA == ZONE_NORMAL anyways, so it can be safely switched off (though arch/sh/mm/init.c should then be changed to use ZONE_NORMAL if ZONE_DMA goes away, as we currently place all lowmem in ZONE_DMA, likewise for sh64). None of our DMA controllers have any particular limitations where ZONE_DMA would be useful at least. - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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