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