On Wed, 2007-05-02 at 11:29 -0400, Jeff Garzik wrote: > Michael Chan wrote: > > A non-IOMMU system using 64-bit dma_addr_t will always set > > CONFIG_HIGHMEM, right? > > No. > May be I misunderstood the code in illegal_highdma() in net/core/dev.c where it is checking to see if it needs to linearize the SKB when the device does not support 64-bit DMA. I'm using similar assumptions for the 40-bit address check in the patch.
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