linux-kernel - selftests/vm madv

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Message-ID: <b703a326-66f7-bf35-58ee-f60e504ea5ef@linuxfoundation.org>
Date:   Fri, 17 Sep 2021 16:45:48 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: selftests/vm madv_populate.c test

Hi David,

I am running into the following warning when try to build this test:

madv_populate.c:334:2: warning: #warning "missing MADV_POPULATE_READ or MADV_POPULATE_WRITE definition" [-Wcpp]
   334 | #warning "missing MADV_POPULATE_READ or MADV_POPULATE_WRITE definition"
       |  ^~~~~~~


I see that the following handling is in place. However there is no
other information to explain why the check is necessary.

#if defined(MADV_POPULATE_READ) && defined(MADV_POPULATE_WRITE)

#else /* defined(MADV_POPULATE_READ) && defined(MADV_POPULATE_WRITE) */

#warning "missing MADV_POPULATE_READ or MADV_POPULATE_WRITE definition"

I do see these defined in:

include/uapi/asm-generic/mman-common.h:#define MADV_POPULATE_READ       22
include/uapi/asm-generic/mman-common.h:#define MADV_POPULATE_WRITE      23

Is this the case of missing include from madv_populate.c?

thanks,
-- Shuah