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Commitf38044e5ef("vfio/iova_bitmap: Fix PAGE_SIZE unaligned bitmaps") had fixed the unaligned bitmaps by capping the remaining iterable set at the start of the bitmap. Although, that mistakenly worked around iova_bitmap_set() incorrectly setting bits across page boundary. Fix this by reworking the loop inside iova_bitmap_set() to iterate over a range of bits to set (cur_bit .. last_bit) which may span different pinned pages, thus updating @page_idx and @offset as it sets the bits. The previous cap to the first page is now adjusted to be always accounted rather than when there's only a non-zero pgoff. While at it, make @page_idx , @offset and @nbits to be unsigned int given that it won't be more than 512 and 4096 respectively (even a bigger PAGE_SIZE or a smaller struct page size won't make this bigger than the above 32-bit max). Also, delete the stale kdoc on Return type. Cc: Avihai Horon <avihaih@nvidia.com> Fixes:f38044e5ef("vfio/iova_bitmap: Fix PAGE_SIZE unaligned bitmaps") Co-developed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Tested-by: Avihai Horon <avihaih@nvidia.com> Link: https://lore.kernel.org/r/20221129131235.38880-1-joao.m.martins@oracle.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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.