[PATCH v3 2/4] libbpf: add support for ints larger than 128 bits
From: Sean Young <sean@mess.org>
Date: 2021-01-05 14:47:06
Also in:
bpf, linux-doc, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
clang supports arbitrary length ints using the _ExtInt extension. This can be useful to hold very large values, e.g. 256 bit or 512 bit types. This requires the _ExtInt extension enabled in clang, which is under review. Link: https://clang.llvm.org/docs/LanguageExtensions.html#extended-integer-types Link: https://reviews.llvm.org/D93103 Signed-off-by: Sean Young <sean@mess.org> --- tools/lib/bpf/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 3c3f2bc6c652..a676373f052b 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c@@ -1722,7 +1722,7 @@ int btf__add_int(struct btf *btf, const char *name, size_t byte_sz, int encoding if (!name || !name[0]) return -EINVAL; /* byte_sz must be power of 2 */ - if (!byte_sz || (byte_sz & (byte_sz - 1)) || byte_sz > 16) + if (!byte_sz || (byte_sz & (byte_sz - 1)) || byte_sz > 64) return -EINVAL; if (encoding & ~(BTF_INT_SIGNED | BTF_INT_CHAR | BTF_INT_BOOL)) return -EINVAL;
--
2.29.2