Re: [PATCH 1/5] radix tree test suite: fix mapshift build target

[Matthew Wilcox <willy@infradead.org>]

On Mon, Jul 16, 2018 at 10:07:10AM -0600, Ross Zwisler wrote:
> Incidentally, in the current linux/master the radix tree test suite again
> fails to build:
> 
>   $ make
>   sed -e 's/^static //' -e 's/__always_inline //' -e 's/inline //' < ../../../lib/radix-tree.c > radix-tree.c
>   sed -e 's/^static //' -e 's/__always_inline //' -e 's/inline //' < ../../../lib/idr.c > idr.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o main.o main.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o linux.o linux.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o test.o test.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o find_bit.o ../../lib/find_bit.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o regression1.o regression1.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o regression2.o regression2.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o regression3.o regression3.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o tag_check.o tag_check.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o multiorder.o multiorder.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o idr-test.o idr-test.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o iteration_check.o iteration_check.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o benchmark.o benchmark.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o idr.o idr.c
>   cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address   -c -o radix-tree.o radix-tree.c
>   idr.c:7:10: fatal error: linux/xarray.h: No such file or directory
>    #include <linux/xarray.h>
>             ^~~~~~~~~~~~~~~~
>   compilation terminated.

Umm.  I think I know the problem here.  I have a suspicion that either
Fedora or you have changed make to be parallel by default (or you're
lying to me and saying you typed 'make' when you actually typed 'make
-j4', but I'm pretty sure you wouldn't do that).  Because there's no
way you'd get this output if you were compiling with make -j1.

Indeed, if I revert your commit and then build with make -j4, I see the
same error as you.  I'll look at how to fix this properly tomorrow.