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bpf: Change bpf_kallsyms_lookup_name size type to ARG_CONST_SIZE_OR_ZERO

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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 <andrii@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211122235733.634914-2-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-11-23 05:27:31 +05:30 committed by Andrii Nakryiko
parent b98057ef73
commit d4efb17086
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/syscall.c
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@ -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,
};