From 07114f0f1cda8b2ef6e884d0c7b268a32cce7903 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@amacapital.net>
Date: Tue, 4 Nov 2014 15:46:21 -0800
Subject: [PATCH] x86_64: Add a comment explaining the TASK_SIZE_MAX guard page

That guard page is absolutely necessary; explain why for
posterity.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/23320cb5017c2da8475ec20fcde8089d82aa2699.1415144745.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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