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Date:   Tue, 31 Mar 2020 16:59:12 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Wei Yang <richard.weiyang@gmail.com>
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Subject: Re: [PATCH 5/9] XArray: entry in last level is not expected to be a
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On Tue, Mar 31, 2020 at 10:04:40PM +0000, Wei Yang wrote:
> cc -I. -I../../include -g -Og -Wall -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined   -c -o main.o main.c
> In file included from ./linux/../../../../include/linux/radix-tree.h:15,
>                  from ./linux/radix-tree.h:5,
>                  from main.c:10:
> ./linux/rcupdate.h:5:10: fatal error: urcu.h: No such file or directory
>     5 | #include <urcu.h>
>       |          ^~~~~~~~
> compilation terminated.
> make: *** [<builtin>: main.o] Error 1

Oh, you need liburcu installed.  On Debian, that's liburcu-dev ... probably
liburcu-devel on Red Hat style distros.