Compilation issue (Invalid usage of the XADD return value)

[prithivi17]

During the compilation, i faced a issue of compilation getting failed with a fatal error (Invalid usage of the XADD return value)

As i searched for the fix, it seems like there is a issue with kprobe_pwru.c code, as i surfed through it i found that the __sync_fetch_and_add() function seems to trigger the issue, It seems like this function is used for translating to XADD. As a workaround, i replaced the function with bpf_xadd(), it seems like the issue is fixed and compilation is exited successfully.

Just wanted to know why __sync_fetch_and_add() function is not working and will there be any effect in the tool function if i change the above mentioned problamatic one with this (bpf_xadd()) one.

Thanks in advance.