Messages in this thread | | | Date | Thu, 21 Apr 2016 16:51:38 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH resend 0/3] mm: allow arch to override lowmem_page_address |
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On Mon, 18 Apr 2016 18:04:54 +0200 Ard Biesheuvel <ard.biesheuvel@linaro.org> 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@linux-foundation.org>
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