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448325199f
bpf_long_memcpy is used while copying to remote percpu regions from BPF syscall and helpers, so that the copy is atomic at word size granularity. This might not be possible when you copy from map value hosting kptrs from or to percpu maps, as the alignment or size in disjoint regions may not be multiple of word size. Hence, to avoid complicating the copy loop, we only use bpf_long_memcpy when special fields are not present, otherwise use normal memcpy to copy the disjoint regions. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20220904204145.3089-2-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@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.