[patch -man] madvise.2: Specify new ENOMEM return value

[David Rientjes <rientjes@google.com>]

madvise(2) may return ENOMEM if the advice acts on a vma that must be
split and creating the new vma will result in the process exceeding
/proc/sys/vm/max_map_count.

Specify this additional possibility.

Signed-off-by: David Rientjes <rientjes@google.com>
---
 man2/madvise.2 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/man2/madvise.2 b/man2/madvise.2
--- a/man2/madvise.2
+++ b/man2/madvise.2
@@ -467,7 +467,12 @@ Not enough memory: paging in failed.
 .TP
 .B ENOMEM
 Addresses in the specified range are not currently
-mapped, or are outside the address space of the process.
+mapped, are outside the address space of the process, or will result in the
+number of areas mapped by this process to exceed
+.I /proc/sys/vm/max_map_count
+(see the Linux kernel source file
+.I Documentation/sysctl/vm.txt
+for more details).
 .TP
 .B EPERM
 .I advice

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