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In a later patch, two new kfuncs will take the bpf_rb_node pointer arg.
struct bpf_rb_node *bpf_rbtree_left(struct bpf_rb_root *root,
struct bpf_rb_node *node);
struct bpf_rb_node *bpf_rbtree_right(struct bpf_rb_root *root,
struct bpf_rb_node *node);
In the check_kfunc_call, there is a "case KF_ARG_PTR_TO_RB_NODE"
to check if the reg->type should be an allocated pointer or should be
a non_owning_ref.
The later patch will need to ensure that the bpf_rb_node pointer passing
to the new bpf_rbtree_{left,right} must be a non_owning_ref. This
should be the same requirement as the existing bpf_rbtree_remove.
This patch swaps the current "if else" statement. Instead of checking
the bpf_rbtree_remove, it checks the bpf_rbtree_add. Then the new
bpf_rbtree_{left,right} will fall into the "else" case to make
the later patch simpler. bpf_rbtree_add should be the only
one that needs an allocated pointer.
This should be a no-op change considering there are only two kfunc(s)
taking bpf_rb_node pointer arg, rbtree_add and rbtree_remove.
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20250506015857.817950-2-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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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.