Using the GNU Compiler Collection (GCC): BPF Function Attributes

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#### 6.33.8 BPF Function Attributes

These function attributes are supported by the BPF back end:

`kernel_helper`

  use this attribute to indicate the specified function declaration is a kernel helper. The helper function is passed as an argument to the attribute. Example:

      int bpf_probe_read (void *dst, int size, const void *unsafe_ptr)
        __attribute__ ((kernel_helper (4)));