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[RFC PATCH v2 0/2] arm64/hugetlb: enable gigantic page

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Arm64 supports different size of gigantic page which can be seen from:
commit 084bd29810a5 ("ARM64: mm: HugeTLB support.")
commit 66b3923a1a0f ("arm64: hugetlb: add support for PTE contiguous bit")

So I tried to use this function by adding hugepagesz=1G in kernel
parameters, with CONFIG_CMA=y. However, when I
echo xx > \
  /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
it failed with the following info:
-bash: echo: write error: Invalid argument

This is a v2 patchset which make gigantic page can be used on arm64,
with CONFIG_CMA=y, or other related configs is enable.

You can see the former discussions at:
https://lkml.org/lkml/2016/8/18/310
 
Xie Yisheng (2):
  mm/hugetlb: Introduce ARCH_HAS_GIGANTIC_PAGE
  arm64 Kconfig: Select gigantic page

 arch/arm64/Kconfig | 1 +
 arch/s390/Kconfig  | 1 +
 arch/x86/Kconfig   | 1 +
 fs/Kconfig         | 4 ++++
 mm/hugetlb.c       | 2 +-
 5 files changed, 8 insertions(+), 1 deletion(-)

-- 
1.7.12.4

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[RFC PATCH v2 0/2] arm64/hugetlb: enable gigantic page Xie Yisheng <xieyisheng1@huawei.com> - 2016-08-22 05:00 +0200
  [RFC PATCH v2 2/2] arm64 Kconfig: Select gigantic page Xie Yisheng <xieyisheng1@huawei.com> - 2016-08-22 05:10 +0200
    Re: [RFC PATCH v2 2/2] arm64 Kconfig: Select gigantic page Michal Hocko <mhocko@kernel.org> - 2016-08-22 10:10 +0200
      Re: [RFC PATCH v2 2/2] arm64 Kconfig: Select gigantic page Catalin Marinas <catalin.marinas@arm.com> - 2016-08-22 12:10 +0200
        Re: [RFC PATCH v2 2/2] arm64 Kconfig: Select gigantic page Yisheng Xie <xieyisheng1@huawei.com> - 2016-08-22 13:40 +0200
    Re: [RFC PATCH v2 2/2] arm64 Kconfig: Select gigantic page Catalin Marinas <catalin.marinas@arm.com> - 2016-08-22 12:30 +0200

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