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This PR updates hardirqs/softirqs to fallback to raw tracepoints if BPF trampoline is not available.

This is part of efforts towards iovisor#4231. Fallback to raw tracepoints
if tp_btf is not available. With this patch, we also remove manual
attach and merge the two irq_handler_entry handlers into one.

Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>
This is part of efforts towards iovisor#4231. Fallback to raw tracepoints
if tp_btf is not available.

Signed-off-by: Hengqi Chen <chenhengqi@outlook.com>
@chenhengqi chenhengqi linked an issue Sep 13, 2022 that may be closed by this pull request
14 tasks
@yonghong-song yonghong-song merged commit e85bd8f into iovisor:master Oct 8, 2022
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Allow libbpf-tools to run on old kernels

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