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

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Date:   Tue, 17 Jul 2018 11:17:24 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        linux-nvdimm@...ts.01.org
Subject: Re: [PATCH 1/5] radix tree test suite: fix mapshift build target

On Mon, Jul 16, 2018 at 08:18:11PM -0700, Matthew Wilcox wrote:
> 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.

Ah, yep.

  $ alias make
  alias make='make -j32'

You've found it. :)