[PATCH 01/11] async_tx: don't use src_list argument of async_xor() for dma addresses

Dan Williams dan.j.williams at intel.com
Tue Dec 9 11:31:13 EST 2008


On Mon, Dec 8, 2008 at 2:55 PM, Yuri Tikhonov <yur at emcraft.com> wrote:
> Using src_list argument of async_xor() as a storage for dma addresses
> implies sizeof(dma_addr_t) <= sizeof(struct page *) restriction which is
> not always true (e.g. ppc440spe).
>

ppc440spe runs with CONFIG_PHYS_64BIT?

If we do this then we need to also change md to limit the number of
allowed disks based on the kernel stack size.  Because with 256 disks
a 4K stack can be consumed by one call to async_pq ((256 sources in
raid5.c + 256 sources async_pq.c) * 8 bytes per source on 64-bit).

Regards,
Dan



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