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Man page of mmap() says that portable applications should ensure fd
argument to be -1 if MAP_ANONYMOUS flag is set as below:
```
The mapping is not backed by any file; its contents are initialized to
zero. The fd and offset arguments are ignored; however, some
implementations require fd to be -1 if MAP_ANONYMOUS (or
MAP_ANON) is specified, and portable applications
should ensure this.
```
However, few mmap() calls under selftests/vm/ uses 0 as fd though they
use MAP_ANONYMOUS flag. This commit changes the argument to be -1 as
recommended.
Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
70d1a4e668