btf: replace decl and type tags with placeholders on unsupported kernels #1615
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Decl tags and type tags appeared in 5.16 and 5.17 respectively. This patch makes it possible to load BTF containing such tags on older kernels by replacing decl tags with integers and type tags with const qualifiers. This mirrors the logic in libbpf. This is convenient if the user wants to load an ELF containing decl tags on global variables (available through CollectionSpec.Variables[].Tags) on older kernels. Signed-off-by: Timo Beckers <[email protected]>
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Decl tags and type tags appeared in 5.16 and 5.17 respectively. This patch makes it possible to load BTF containing such tags on older kernels by replacing decl tags with integers and type tags with const qualifiers. This mirrors the logic in libbpf.
This is convenient if the user wants to load an ELF containing decl tags on global variables (available through CollectionSpec.Variables[].Tags) on older kernels.