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The very generic error code EINVAL, in function tty0tty_write, replaced with more informative "No buffer space available" return code ENOBUFS. Signed-off-by: Geert Stappers <stappers@stappers.it>
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Based on: http://dpdk.org/dev/patchwork/patch/22036/
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Default value is 4
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Add newlines to printk lines.
