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BPF: add extern func to data sections if specified

Authored by yonghong-song on Mar 25 2021, 2:09 PM.

Description

BPF: add extern func to data sections if specified

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

Details

Committed
yonghong-songMar 25 2021, 4:03 PM
Differential Revision
D93563: BPF: add extern func to data sections if specified
Parents
rG3fd64cc7a361: [ValueTracking] Handle two PHIs in isKnownNonEqual()
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