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A BAR size is always a power of two. buf_size = min(SZ_1M, bar_size). If the BAR size is <= 1MB, there will be one iteration, no remainder. If the BAR size is > 1MB, there will be more than one iteration, but the size will always be evenly divisible by 1MB, so no remainder. Link: https://lore.kernel.org/r/20250109094556.1724663-2-18255117159@163.com Suggested-by: Niklas Cassel <cassel@kernel.org> Signed-off-by: Hans Zhang <18255117159@163.com> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Niklas Cassel <cassel@kernel.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.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 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.