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# Release notes for `perf-event-open-sys`
## 3.0.0
- Based on Linux kernel headers packaged by Fedora as `kernel-headers-5.18.4-200.fc36`.
- Fix build for Android, x86_64-unknown-linux-musl.
- Remove redundant prefixes from `bindings` constants derived from enums in
the Linux kernel headers.
For example, the kernel headers have the definition:
/*
* attr.type
*/
enum perf_type_id {
PERF_TYPE_HARDWARE = 0,
PERF_TYPE_SOFTWARE = 1,
PERF_TYPE_TRACEPOINT = 2,
...
};
This crate used to render the above as constants like this:
pub const perf_type_id_PERF_TYPE_HARDWARE: perf_type_id = 0;
pub const perf_type_id_PERF_TYPE_SOFTWARE: perf_type_id = 1;
pub const perf_type_id_PERF_TYPE_TRACEPOINT: perf_type_id = 2;
...
The names incorporate the names of both the C enum and its constants. But
since the constants' names are already prefixed (necessary because C places
enumeration constants in the 'ordinary identifier' namespace), this is
redundant.
In v3.0.0, these constants are rendered in Rust like this:
pub const PERF_TYPE_HARDWARE: perf_type_id = 0;
pub const PERF_TYPE_SOFTWARE: perf_type_id = 1;
pub const PERF_TYPE_TRACEPOINT: perf_type_id = 2;
Here's the full list of prefixes that were stripped, in case you want to
`sed` your way through a conversion:
bp_type_idx_
perf_bpf_event_type_
perf_branch_sample_type_
perf_branch_sample_type_shift_
perf_callchain_context_
perf_event_ioc_flags_
perf_event_ioctls_
perf_event_read_format_
perf_event_sample_format_
perf_event_type_
perf_hw_cache_id_
perf_hw_cache_op_result_id_
perf_hw_id_
perf_record_ksymbol_type_
perf_sample_regs_abi_
perf_sw_ids_
perf_type_id_
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