selftests/vm madv_populate.c test

Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> · Fri, 17 Sep 2021 16:45:48 -0600

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