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authorPeter Hurley <peter@hurleysoftware.com>2013-06-15 09:36:08 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-23 16:47:08 -0700
commit7bfe0b7116be207cf2204ae06335cc89d8f8ee02 (patch)
tree03175cd2ce9dd8013c4aaa8e2dd426767aa1a4c7 /include/linux/tty.h
parent7391ee16950e772076d321792d9fbf030f921345 (diff)
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.h')
-rw-r--r--include/linux/tty.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 2e93eb831c61..7c124541f011 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -71,8 +71,7 @@ struct tty_bufhead {
struct tty_buffer *head; /* Queue head */
struct tty_buffer *tail; /* Active buffer */
struct llist_head free; /* Free queue head */
- int memory_used; /* Buffer space used excluding
- free queue */
+ atomic_t memory_used; /* In-use buffers excluding free list */
};
/*
* When a break, frame error, or parity error happens, these codes are