internal/sys: add constants #1537
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lmb
commented
Aug 6, 2024
| @@ -227,7 +227,7 @@ func init() { | |||
| } | |||
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| // MapFlags document which flags may be feature probed. | |||
| type MapFlags = sys.MapFlags | |||
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This is the breaking change the linter is complaining about. I don't think this should make a difference in practice.
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Nope, should be fine since external callers never had access to sys.MapFlags anyway.
ti-mo
approved these changes
Aug 6, 2024
bpf.h defines a bunch of constants as unnamed enums. This makes them tricky to pull out of vmlinux BTF, so instead we rely on the internal/unix shim. This causes a small maintenance burden whenever we need a new flag, but more importantly it makes some upcoming cross platform work harder. Pull the constant definitions out of vmlinux BTF instead of relying on package unix. Unfortunately a bunch of the flags are re-used. This is most noticeable for MapFlags, for which the enum in the kernel has become a bit of a grab bag. Instead of trying hard to wrap everything into a neat type we just generate untyped constants and get rid of MapFlags. Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Some constants in bpf.h are defined using the C preprocessor and are therefore not available in BTF. Add them manually. Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
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internal/sys: generate constants from unnamed enums
internal/sys: add DEFINEd constants