From: Kumar Kartikeya Dwivedi Date: Mon, 14 Nov 2022 19:15:22 +0000 (+0530) Subject: bpf: Remove local kptr references in documentation X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1f6d52f1a8947436dc5b2575e2fffb831f240141;p=linux.git bpf: Remove local kptr references in documentation We don't want to commit to a specific name for these. Simply call them allocated objects coming from bpf_obj_new, which is completely clear in itself. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20221114191547.1694267-2-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- diff --git a/Documentation/bpf/bpf_design_QA.rst b/Documentation/bpf/bpf_design_QA.rst index 17e774d96c5e4..cec2371173d7e 100644 --- a/Documentation/bpf/bpf_design_QA.rst +++ b/Documentation/bpf/bpf_design_QA.rst @@ -332,13 +332,14 @@ avoid defining types with 'bpf\_' prefix to not be broken in future releases. In other words, no backwards compatibility is guaranteed if one using a type in BTF with 'bpf\_' prefix. -Q: What is the compatibility story for special BPF types in local kptrs? ------------------------------------------------------------------------- -Q: Same as above, but for local kptrs (i.e. pointers to objects allocated using -bpf_obj_new for user defined structures). Will the kernel preserve backwards +Q: What is the compatibility story for special BPF types in allocated objects? +------------------------------------------------------------------------------ +Q: Same as above, but for allocated objects (i.e. objects allocated using +bpf_obj_new for user defined types). Will the kernel preserve backwards compatibility for these features? A: NO. Unlike map value types, there are no stability guarantees for this case. The -whole local kptr API itself is unstable (since it is exposed through kfuncs). +whole API to work with allocated objects and any support for special fields +inside them is unstable (since it is exposed through kfuncs).