On 18 April 2016 at 18:04, 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 s/pulling/willing/ > agree with the contents)? Thanks. > > Ard Biesheuvel (3): > nios2: use correct void* return type for page_to_virt() > openrisc: drop wrongly typed definition of page_to_virt() > mm: replace open coded page to virt conversion with page_to_virt() > > arch/nios2/include/asm/io.h | 1 - > arch/nios2/include/asm/page.h | 2 +- > arch/nios2/include/asm/pgtable.h | 2 +- > arch/openrisc/include/asm/page.h | 2 -- > include/linux/mm.h | 6 +++++- > 5 files changed, 7 insertions(+), 6 deletions(-) > > -- > 2.5.0 > -- 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>