[patch] madvise.2: specify MADV_REMOVE returns EINVAL for hugetlbfs

[David Rientjes]

madvise(2) actually returns with error EINVAL for MADV_REMOVE when used 
for hugetlb vmas, not EOPNOTSUPP, and this has been the case since 
MADV_REMOVE was introduced in commit f6b3ec238d12 ("madvise(MADV_REMOVE): 
remove pages from tmpfs shm backing store").

Specify the exact behavior.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 man2/madvise.2 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/man2/madvise.2 b/man2/madvise.2
index a3d93bb..00db39d 100644
--- a/man2/madvise.2
+++ b/man2/madvise.2
@@ -184,7 +184,9 @@ any filesystem which supports the
 .BR FALLOC_FL_PUNCH_HOLE
 mode also supports
 .BR MADV_REMOVE .
-Other filesystems fail with the error
+Hugetlbfs will fail with the error
+.BR EINVAL
+and other filesystems fail with the error
 .BR EOPNOTSUPP .
 .TP
 .BR MADV_DONTFORK " (since Linux 2.6.16)"
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