On 2022/10/5 9:17, Mike Kravetz wrote: > 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. > > Fixes: "hugetlb: clean up code checking for fault/truncation races" > Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> I believe this is a feasible solution. Thanks. Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Thanks, Miaohe Lin
