On Mon, 18 Apr 2016 18:04:54 +0200 Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: > These patches allow the arch to define the page_to_virt() conversion that > is used in lowmem_page_address(). This is desirable for arm64, where this > conversion is trivial when CONFIG_SPARSEMEM_VMEMMAP is enabled, while > breaking it up into __va(PFN_PHYS(page_to_pfn(page))), as is done currently > in lowmem_page_address(), will force the use of a virt-to-phys() conversion > and back again, which always involves a memory access on arm64, since the > start of physical memory is not a compile time constant. > > I have split off these patches from my series 'arm64: optimize virt_to_page > and page_address' which I sent out 3 weeks ago, and resending them in the > hope that they can be picked up (with Will's ack on #3) to be merged via > the mm tree. > > I have cc'ed the nios2 and openrisc maintainers on previous versions, and > cc'ing them again now. I have dropped both of the arch specific mailing > lists, since one is defunct and the other is subscriber only. > > Andrew, is this something you would be pulling to pick up (assuming that you > agree with the contents)? Thanks. Looks OK to me and apart from the trivial openrisc/nios2 changes it's obviously a no-op for all-but-arm. So I suggest you include these patches in the appropriate arm tree. Acked-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>