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| author |   Peter Hurley <peter@hurleysoftware.com> | 2013-06-15 09:36:08 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-23 16:47:08 -0700 |
| commit | 7bfe0b7116be207cf2204ae06335cc89d8f8ee02 (patch) | |
| tree | 03175cd2ce9dd8013c4aaa8e2dd426767aa1a4c7 /include/linux/tty_flip.h | |
| parent | tty: Simplify flip buffer list with 0-sized sentinel (diff) | |
| download | linux-dev-7bfe0b7116be207cf2204ae06335cc89d8f8ee02.tar.xz linux-dev-7bfe0b7116be207cf2204ae06335cc89d8f8ee02.zip | |
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>
Diffstat (limited to 'include/linux/tty_flip.h')
| -rw-r--r-- | include/linux/tty_flip.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h index ad0303994c32..6944ed2ce692 100644 --- a/include/linux/tty_flip.h +++ b/include/linux/tty_flip.h @@ -1,6 +1,7 @@ #ifndef _LINUX_TTY_FLIP_H #define _LINUX_TTY_FLIP_H +extern int tty_buffer_space_avail(struct tty_port *port); extern int tty_buffer_request_room(struct tty_port *port, size_t size); extern int tty_insert_flip_string_flags(struct tty_port *port, const unsigned char *chars, const char *flags, size_t size); |