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# API version number
The file API_VERSION must contain a semver-like version number of the userspace<->kernel API. All other lines are ignored.
## When to increment
**major version**: increment when the driver API becomes incompatible with previous userspace versions
**minor version**: increment when new features are added but existing features remain compatible
**patch version**: increment when code changes don't break compatibility (e.g. bug fixes)
Do *not* increment for patches that only add support for new kernels, without affecting already supported ones.
# Schema version number
The file SCHEMA_VERSION must contain a semver-like version number of the event schema. All other lines are ignored.
## When to increment
**major version**: increment when the schema becomes incompatible with previous userspace versions
**minor version**: increment when new features are added but existing features remain compatible (e.g. new event fields or new events)
**patch version**: increment when code changes don't break compatibility (e.g. bug fixes in filler code)
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