From: Peter Hurley <peter@hurleysoftware.com>
Date: Sat, 15 Jun 2013 13:36:08 +0000 (-0400)
Subject: tty: Track flip buffer memory limit atomically
X-Git-Tag: v3.12-rc1~182^2~190
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bfe0b7116be207cf2204ae06335cc89d8f8ee02;p=pandora-kernel.git

tty: Track flip buffer memory limit atomically

Lockless flip buffers require atomically updating the bytes-in-use
watermark.

The pty driver also peeks at the watermark value to limit
memory consumption to a much lower value than the default; query
the watermark with new fn, tty_buffer_space_avail().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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