Messages in this thread | | | Date | Fri, 27 Jan 2006 19:43:19 +0000 | From | Russell King <> | Subject | Re: How to map high memory for block io |
| |
On Fri, Jan 27, 2006 at 01:14:15PM +0100, Pierre Ossman wrote: > Russell, would having a "highmem not supported" flag in the host > structure be an acceptable solution? mmc_block could then use that to > tell the block layer that bounce buffers are needed. As for other, > future, users they would have to take care not to give those drivers > highmem sg lists.
The mmc_block layer only tells the block layer what the driver told it.
> The current buggy code, was modeled after another MMC driver (mmci). So > I suspect there might be more occurrences like this. Perhaps an audit > should be added as a janitor project?
I don't see what the problem is. A sg entry is a list of struct page pointers, an offset, and a size. As such, it can't describe a transfer which crosses a page because such a structure does not imply that one struct page follows another struct page.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |