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The hugetlb vma lock was originally designed to synchronize pmd sharing. As such, it was only necessary to allocate the lock for vmas that were capable of pmd sharing. Later in the development cycle, it was discovered that it could also be used to simplify fault/truncation races as described in [1]. However, a subsequent change to allocate the lock for all vmas that use the page cache was never made. A fault/truncation race could leave pages in a file past i_size until the file is removed. Remove the previous restriction and allocate lock for all VM_MAYSHARE vmas. Warn in the unlikely event of allocation failure. [1] https://lore.kernel.org/lkml/Yxiv0SkMkZ0JWGGp@monkey/#t Link: https://lkml.kernel.org/r/20221005011707.514612-4-mike.kravetz@oracle.com Fixes: "hugetlb: clean up code checking for fault/truncation races" Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: David Hildenbrand <david@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: James Houghton <jthoughton@google.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mina Almasry <almasrymina@google.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Peter Xu <peterx@redhat.com> Cc: Prakash Sangappa <prakash.sangappa@oracle.com> Cc: Sven Schnelle <svens@linux.ibm.com> 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.