x86_64: Add a comment explaining the TASK_SIZE_MAX guard page
authorAndy Lutomirski <luto@amacapital.net>
Tue, 4 Nov 2014 23:46:21 +0000 (15:46 -0800)
committerIngo Molnar <mingo@kernel.org>
Mon, 10 Nov 2014 09:43:13 +0000 (10:43 +0100)
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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