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

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Message-ID: <alpine.DEB.2.10.1701241431530.42507@chino.kir.corp.google.com>
Date:   Tue, 24 Jan 2017 14:32:17 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     mtk.manpages@...il.com
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Johannes Weiner <hannes@...xchg.org>,
        Jerome Marchand <jmarchan@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-man@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [patch -man] madvise.2: Specify new ENOMEM return value

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@...gle.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