From 63be110a96aea4d0b5d5fe34cbd3ecf0819e14a3 Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Mon, 19 Oct 2026 17:10:04 -0400 Subject: [PATCH] bpf: Drop unused entries from special_kfunc_list again Commit 6f033615ef8f ("bpf: Trim special_kfunc_list in verifier") dropped bpf_arena_reserve_pages, bpf_stream_vprintk and bpf_stream_print_stack from special_kfunc_list once nothing used them anymore, but commit ab7fff217fd1 ("bpf: Check helper and kfunc arguments in one path") brought all three back without adding any users. Besides being dead, the bpf_arena_reserve_pages entry can't be resolved on 32-bit and !MMU kernels, which don't build arena.o, and since commit 201a454df948 ("resolve_btfids: Fix the --fatal_warnings exit status") the resulting resolve_btfids warning fails the build with CONFIG_WERROR=y: WARN: resolve_btfids: unresolved symbol bpf_arena_reserve_pages Drop the three entries again. Fixes: ab7fff217fd1 ("bpf: Check helper and kfunc arguments in one path") Signed-off-by: Sasha Levin Signed-off-by: Alexei Starovoitov Link: https://patch.msgid.link/20261019211006.2574350-2-sashal@kernel.org --- kernel/bpf/verifier.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 015dc1bccebe..d49b7ea2c002 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -13612,10 +13612,7 @@ enum special_kfunc_type { KF_bpf_call_rcu_tasks_trace, KF_bpf_arena_alloc_pages, KF_bpf_arena_free_pages, - KF_bpf_arena_reserve_pages, KF_bpf_session_is_return, - KF_bpf_stream_vprintk, - KF_bpf_stream_print_stack, }; BTF_ID_LIST(special_kfunc_list) @@ -13707,14 +13704,11 @@ BTF_ID(func, bpf_call_rcu) BTF_ID(func, bpf_call_rcu_tasks_trace) BTF_ID(func, bpf_arena_alloc_pages) BTF_ID(func, bpf_arena_free_pages) -BTF_ID(func, bpf_arena_reserve_pages) #ifdef CONFIG_BPF_EVENTS BTF_ID(func, bpf_session_is_return) #else BTF_ID_UNUSED #endif -BTF_ID(func, bpf_stream_vprintk) -BTF_ID(func, bpf_stream_print_stack) static bool is_bpf_cast_to_kern_ctx_kfunc(const struct bpf_call_arg_meta *meta) {