diff mbox series

[bpf-next,v4,1/2] libbpf: do not resolve size on duplicate FUNCs

Message ID 20241002-libbpf-dup-extern-funcs-v4-1-560eb460ff90@hack3r.moe (mailing list archive)
State New
Delegated to: BPF
Headers show
Series BPF static linker: fix linking duplicate extern functions | expand

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bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
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netdev/build_clang success Errors and warnings before: 7 this patch: 7
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Commit Message

Eric Long via B4 Relay Oct. 2, 2024, 6:25 a.m. UTC 
From: Eric Long <i@hack3r.moe>

FUNCs do not have sizes, thus currently btf__resolve_size will fail
with -EINVAL. Add conditions so that we only update size when the BTF
object is not function or function prototype.

Signed-off-by: Eric Long <i@hack3r.moe>
---
 tools/lib/bpf/linker.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index 81dbbdd79a7c65a4b048b85e1dba99cb5f7cb56b..f83c1c29982c3d9d7f6775cd98a6f3387a4e9c50 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -2451,6 +2451,10 @@  static int linker_append_btf(struct bpf_linker *linker, struct src_obj *obj)
 			if (glob_sym && glob_sym->var_idx >= 0) {
 				__s64 sz;
 
+				/* FUNCs don't have size, nothing to update */
+				if (btf_is_func(t))
+					continue;
+
 				dst_var = &dst_sec->sec_vars[glob_sym->var_idx];
 				/* Because underlying BTF type might have
 				 * changed, so might its size have changed, so