Re: [PATCH v3 bpf-next 1/5] bpf: Rename __kptr_ref -> __kptr and __kptr -> __kptr_untrusted.
From: David Vernet <void@manifault.com>
Date: 2023-02-28 15:16:38
Also in:
bpf
On Mon, Feb 27, 2023 at 08:01:17PM -0800, Alexei Starovoitov wrote:
From: Alexei Starovoitov <ast@kernel.org> __kptr meant to store PTR_UNTRUSTED kernel pointers inside bpf maps. The concept felt useful, but didn't get much traction, since bpf_rdonly_cast() was added soon after and bpf programs received a simpler way to access PTR_UNTRUSTED kernel pointers without going through restrictive __kptr usage. Rename __kptr_ref -> __kptr and __kptr -> __kptr_untrusted to indicate its intended usage. The main goal of __kptr_untrusted was to read/write such pointers directly while bpf_kptr_xchg was a mechanism to access refcnted kernel pointers. The next patch will allow RCU protected __kptr access with direct read. At that point __kptr_untrusted will be deprecated. Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: David Vernet <void@manifault.com>