linux-kernel - [PATCH 0/2] selftests/vm: fix some minor aggravating factors in the Makefile

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Message-ID: <20200915012901.1655280-1-jhubbard@nvidia.com>
Date:   Mon, 14 Sep 2020 18:28:59 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Shuah Khan <shuah@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-kselftest@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 0/2] selftests/vm: fix some minor aggravating factors in the Makefile

Hi,

This fixes a couple of minor aggravating factors that I ran across while
trying to do some changes in selftests/vm. These are simple things, but
like most things with GNU Make, it's rarely obvious what's wrong until
you understand *the entire Makefile and all of its includes*.

So while there is, of course, joy in learning those details, I thought I'd
fix these little things, so as to allow others to skip out on the Joy if
they so choose. :)

First of all, if you have an item (let's choose userfaultfd for an
example) that fails to build, you might do this:

$ make -j32

    # ...you observe a failed item in the threaded output

# OK, let's get a closer look

$ make
    # ...but now the build quietly "succeeds".

That's what Patch 0001 fixes.

Second, if you instead attempt this approach for your closer look (a casual
mistake, as it's not supported):

$ make userfaultfd

    # ...userfaultfd fails to link, due to incomplete LDLIBS

That's what Patch 0002 fixes.

John Hubbard (2):
  selftests/vm: fix false build success on the second and later attempts
  selftests/vm: fix incorrect gcc invocation in some cases

 tools/testing/selftests/vm/Makefile | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

-- 
2.28.0