From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sean Anderson <seanga2@gmail.com>
Date: Mon, 20 Jan 2020 21:17:05 -0500
Subject: [PATCH v2 03/11] riscv: Add headers for asm/global_data.h
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> I wonder why the compiling is OK without those appropriate headers.

It's likely that all the uses looked like

#include <this_header_includes_ulong.h>
#include <asm/global_data.h>

So it wasn't noticed until it was included first in some file.