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[ Upstream commit 1bd293fcf3af84674e82ed022c049491f3768840 ] bio_vec start offset may be relatively large particularly when large folio gets added to the bio. A bigger offset will result in avoiding the single-segment mapping optimization and end up using expensive mempool_alloc further. Rather than using absolute value, adjust bv_offset by NVME_CTRL_PAGE_SIZE while checking if segment can be fitted into one/two PRP entries. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kundan Kumar <kundan.kumar@samsung.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.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.