Messages in this thread | | | Date | Mon, 30 Mar 2009 14:11:56 -0700 (PDT) | Subject | Re: Removing __kernel_old_uid_t, git_t, dev_t | From | David Miller <> |
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From: Arnd Bergmann <arnd@arndb.de> Date: Mon, 30 Mar 2009 17:17:56 +0200
> dma_addr_t is a big mess that was traditionally defined per > architecture, in lots of wrong ways, including the misconception > of dma64_addr_t. Sparc64 still uses a 32 bit dma_addr_t, possibly > because it always uses an IOMMU (?). It can save some space in > scatterlists, but might come back to bite us if someone tries > to build a sparc64 system with actual 64-bit DMA.
There is no reason to use anything larger than a 32-bit DMA address type on sparc64, and using 32-bit saves lots of space in many data structures so I am unlikely to ever change this. :-)
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