Messages in this thread | | | Subject | [PATCH 0 of 2] MMIO copy patches, the next generation | Date | Thu, 12 Jan 2006 09:05:30 -0800 | From | Bryan O'Sullivan <> |
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After another round of review, here is a revised set of MMIO copy patches.
These have switched the name of the copy routine to __iowrite32_copy, to match the naming convention in include/asm-generic/iomap.h, and at Andi's request. The name is double-underscored to make it clear that the routine does not guarantee the order of writes or perform a memory barrier; the kernel doc also explicitly states this.
These define the generic __iowrite32_copy as a weak symbol, which arches are free to override. We provide a specialised implementation for x86_64. In a change from prior versions of these patches, the x86_64 version no longer makes any assumptions about the bus breaking up 64-bit transactions, and uses 32-bit copies directly.
We also introduce include/linux/io.h, which is tiny now, but a candidate for later cleanups of all the per-arch asm-*/{io,iomap}.h files.
These patches should apply cleanly against current -git, and have been tested on i386 and x86_64.
The patch series is as follows:
iomap_copy.patch Introduce the generic MMIO 32-bit copy routine.
x86_64-iomap_copy.patch Add a faster __iowrite32_copy routine to x86_64.
Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
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