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From: Florian Weimer <fweimer@redhat.com>
To: "HON LUU" <hon@dreambigsemi.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>,  "gcc-help@gcc.gnu.org"
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Subject: Re: gcc question
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Date: Mon, 13 Sep 2021 21:51:17 +0200
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* HON LUU:

> I build "device driver code" in userspace code, but using the same
> headers from kernel source code.
>
> In the driver code, we include "linux/pci.h" header, and through
> include chain arch_static_branch() got pulling through inline
> functions.

You need to do replace arch_static_branch with something else.  It
cannot be used in userspace.

Thanks,
Florian