remove the ->mapping_error method from dma_map_ops V2
From: torvalds@linux-foundation.org (Linus Torvalds)
Date: 2018-11-22 17:10:10
Also in:
linux-alpha, linux-arch, linux-iommu, lkml
On Thu, Nov 22, 2018 at 9:07 AM Russell King - ARM Linux [off-list ref] wrote:
I'm afraid that won't work very well - 32 bit platforms with 64-bit addresses (LPAE) would have dma_addr_t as a 64-bit value, which wouldn't fit into an unsigned long.
Good point. So we'd have to have a special IS_DMA_ERR() function that
takes a dma_addr_t and checks the same "is it the top 4095 values".
Because I'd still prefer to allow people to return the _actual_ error,
and to have "return -Exyz" as the error case. That part still DTRT
even with dma_addr_t.
Linus