The function tracing_alloc_snapshot() is only used between trace.c and trace_snapshot.c. When snapshot isn't configured, it's not used at all. The stub function was defined as a global with no users and no prototype causing build issues. Remove the function when snapshot isn't configured as nothing is calling it. Also remove the EXPORT_SYMBOL_GPL() that was associated with it as it's not used outside of the tracing subsystem which also includes any modules.
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| @@ -810,19 +810,12 @@ int tracing_alloc_snapshot(void) · 809 unmodified lines | ||
| 810 | 810 | |
| 811 | 811 | return ret; |
| 812 | 812 | } |
| 813 | −EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
| 814 | 813 | #else |
| 815 | 814 | void tracing_snapshot(void) |
| 816 | 815 | { |
| 817 | 816 | WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); |
| 818 | 817 | } |
| 819 | 818 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
| 820 | −int tracing_alloc_snapshot(void) | |
| 821 | −{ | |
| 822 | − WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used"); | |
| 823 | − return -ENODEV; | |
| 824 | −} | |
| 825 | −EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
| 826 | 819 | void tracing_snapshot_alloc(void) |
| 827 | 820 | { |
| 828 | 821 | /* Give warning */ |