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3938fc29f8
Currently, ext4_mb_get_buddy_page_lock() uses blocks_per_page to calculate folio index and offset. However, when blocksize is larger than PAGE_SIZE, blocks_per_page becomes zero, leading to a potential division-by-zero bug. To support BS > PS, use bytes to compute folio index and offset within folio to get rid of blocks_per_page. Also, since ext4_mb_get_buddy_page_lock() already fully supports folio, rename it to ext4_mb_get_buddy_folio_lock(). Signed-off-by: Baokun Li <libaokun1@huawei.com> Reviewed-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Message-ID: <20251121090654.631996-13-libaokun@huaweicloud.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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 reStructuredText 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.