From: Kumar Kartikeya Dwivedi Date: Mon, 22 Nov 2021 23:57:31 +0000 (+0530) Subject: bpf: Change bpf_kallsyms_lookup_name size type to ARG_CONST_SIZE_OR_ZERO X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d4efb170861827290f7f571020001a60d001faaf;p=linux.git bpf: Change bpf_kallsyms_lookup_name size type to ARG_CONST_SIZE_OR_ZERO Andrii mentioned in [0] that switching to ARG_CONST_SIZE_OR_ZERO lets user avoid having to prove that string size at runtime is not zero and helps with not having to supress clang optimizations. [0]: https://lore.kernel.org/bpf/CAEf4BzZa_vhXB3c8atNcTS6=krQvC25H7K7c3WWZhM=27ro=Wg@mail.gmail.com Suggested-by: Andrii Nakryiko Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Andrii Nakryiko Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20211122235733.634914-2-memxor@gmail.com --- diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 50f96ea4452a2..47089d1d67a43 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -4804,7 +4804,7 @@ const struct bpf_func_proto bpf_kallsyms_lookup_name_proto = { .gpl_only = false, .ret_type = RET_INTEGER, .arg1_type = ARG_PTR_TO_MEM, - .arg2_type = ARG_CONST_SIZE, + .arg2_type = ARG_CONST_SIZE_OR_ZERO, .arg3_type = ARG_ANYTHING, .arg4_type = ARG_PTR_TO_LONG, };