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This permits extern function (BTF_KIND_FUNC) be added
to BTF_KIND_DATASEC if a section name is specified.
For example,
-bash-4.4$ cat t.c
void foo(int) __attribute__((section(".kernel.funcs")));
int test(void) {
foo(5);
return 0;
}
The extern function foo (BTF_KIND_FUNC) will be put into
BTF_KIND_DATASEC with name ".kernel.funcs".
This will help to differentiate two kinds of external functions,
functions in kernel and functions defined in other bpf programs.
Differential Revision: https://reviews.llvm.org/D93563
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