79ff13e991
mmap() bpf_arena right after creation, since the kernel needs to remember the address returned from mmap. This is user_vm_start. LLVM will generate bpf_arena_cast_user() instructions where necessary and JIT will add upper 32-bit of user_vm_start to such pointers. Fix up bpf_map_mmap_sz() to compute mmap size as map->value_size * map->max_entries for arrays and PAGE_SIZE * map->max_entries for arena. Don't set BTF at arena creation time, since it doesn't support it. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20240308010812.89848-9-alexei.starovoitov@gmail.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.