linux-kernel - Re: [PATCH v2 10/11] selftests/mm: move uffd* routines from vm

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Date:   Mon, 5 Jun 2023 12:09:56 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Peter Xu <peterx@...hat.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>, <linux-mm@...ck.org>,
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 10/11] selftests/mm: move uffd* routines from vm_util.c
 to uffd-common.c

On 6/5/23 08:59, Peter Xu wrote:
...
>> -$(OUTPUT)/uffd-stress: uffd-common.c
>> -$(OUTPUT)/uffd-unit-tests: uffd-common.c
>> +$(OUTPUT)/uffd-stress:          uffd-common.c
>> +$(OUTPUT)/uffd-unit-tests:      uffd-common.c
>> +$(OUTPUT)/hugepage-mremap:      uffd-common.c
>> +$(OUTPUT)/write_to_hugetlbfs:   uffd-common.c
>> +$(OUTPUT)/ksm_functional_tests: uffd-common.c
> 
> Sorry, John, I still cannot follow..
> 
> As I said before uffd-common.[ch] was for uffd stress/unit tests.  I
> confess my fault to not have named it uffd-test-common.[ch] already.

Actually, given that there is nothing *except* test code in this
directory, I think your original choice of file names is just right.

> 
> I think it's fine to keep uffd_*() helpers in vm_util.[ch] for now, until
> it grows.  Just like if one day we'll have a pagemap.c test we don't
> necessary need to move pagemap_*() helpers from vm_utils.[ch] into
> pagemap.[ch].  It just keeps common test helpers.
> 
> Can we avoid linking those into other tests in whatever way?  Maybe
> renaming it to uffd-test-common.[ch] may be cleaner?
> 

It sounds like you are suggesting this:

$(OUTPUT)/uffd-stress:          uffd-common.c uffd-test-common.c
$(OUTPUT)/uffd-unit-tests:      uffd-common.c uffd-test-common.c
$(OUTPUT)/hugepage-mremap:      uffd-test-common.c
$(OUTPUT)/write_to_hugetlbfs:   uffd-test-common.c
$(OUTPUT)/ksm_functional_tests: uffd-test-common.c

...approximately. Do I have that correct? I can arrange it that way
if you feel it's a better end result. (And it's better than leaving
uffd*() helpers in vm_utils, imho.)

thanks,
-- 
John Hubbard
NVIDIA