linux-kernel - Re: [PATCH 12/12] selftests/mm: fix uffd-unit-tests.c build failure due to missing MADV

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Date:   Fri, 2 Jun 2023 15:26:38 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     David Hildenbrand <david@...hat.com>, Peter Xu <peterx@...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 12/12] selftests/mm: fix uffd-unit-tests.c build failure
 due to missing MADV_COLLAPSE

On 6/2/23 09:34, Muhammad Usama Anjum wrote:
> On 6/2/23 6:33 AM, John Hubbard wrote:
>> MADV_PAGEOUT, MADV_POPULATE_READ, MADV_COLLAPSE are conditionally
>> defined as necessary. However, that was being done in .c files, and a
>> new build failure came up that would have been automatically avoided had
>> these been in a common header file.
> There is a better way. Just like I've mentioned that building in-tree
> kernel headers and then mm selftests don't produce any build failures as
> they pick up in-tree compiled kernel header files. Don't move these

OK.

> definations to vm_util.h. Instead include asm-generic/mman-common.h which
> has all these definitions already. I've just removed what you have removed
> in this patch and include asm-generic/mman-common.h. It builds fine. But
> then there are more duplicated definition warnings.

umm, that's still a major problem. But let me look into it, based on
your recommended approach of "make headers" first, thanks.


thanks,
-- 
John Hubbard
NVIDIA