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The HugeTLB address ranges are linearly scanned during fork, unmap and remap operations, and the linear scan can skip to the end of range mapped by the page table page if hitting a non-present entry, which can help to speed linear scanning of the HugeTLB address ranges. So hugetlb_mask_last_page() is introduced to help to update the address in the loop of HugeTLB linear scanning with getting the last huge page mapped by the associated page table page[1], when a non-present entry is encountered. Considering ARM64 specific cont-pte/pmd size HugeTLB, this patch implemented an ARM64 specific hugetlb_mask_last_page() to help this case. [1] https://lore.kernel.org/linux-mm/20220527225849.284839-1-mike.kravetz@oracle.com/ [baolin.wang@linux.alibaba.com: fix build] Link: https://lkml.kernel.org/r/a14e7b39-6a8a-4609-b4a1-84ac574f5c96@linux.alibaba.com Link: https://lkml.kernel.org/r/20220621235620.291305-3-mike.kravetz@oracle.com Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Muchun Song <songmuchun@bytedance.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: David Hildenbrand <david@redhat.com> Cc: James Houghton <jthoughton@google.com> Cc: kernel test robot <lkp@intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mina Almasry <almasrymina@google.com> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Xu <peterx@redhat.com> Cc: Rolf Eike Beer <eike-kernel@sf-tec.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.