tty.h is large enough currently. And I am slowly adding kernel-doc
documentation, so it grows to unmaintainable long mess. To avoid this,
split tty.h further into tty_buffer.h and move there tty_buffer-related
declarations and function prototypes.
Note that many of the tty_buffer.c function prototypes reside now in
tty_flip.h. But we cannot move struct tty_buffer & friends because:
* tty_insert_flip_char() in tty_flip.h needs both struct tty_port and
struct tty_buffer defined.
* struct tty_port in tty_port.h needs struct tty_buffer defined.
So if we moved struct tty_buffer to tty_flip.h too, tty_flip.h would
need tty_port.h and that would need tty_flip.h (to have tty_buffer)
again. Hence we introduce new header tty_buffer.h here to break this
circular dependency.
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
include/linux/tty.h | 49 +------------------------------
include/linux/tty_buffer.h | 59 ++++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+), 48 deletions(-)
create mode 100644 include/linux/tty_buffer.h
diff --git a/include/linux/tty.h b/include/linux/tty.h
index fad53f69a8ca..b5f353797cec 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -6,6 +6,7 @@
#include <linux/major.h>
#include <linux/termios.h>
#include <linux/workqueue.h>
+#include <linux/tty_buffer.h>
#include <linux/tty_driver.h>
#include <linux/tty_ldisc.h>
#include <linux/mutex.h>
@@ -30,54 +31,6 @@
*/
#define __DISABLED_CHAR '\0'
-struct tty_buffer {
- union {
- struct tty_buffer *next;
- struct llist_node free;
- };
- int used;
- int size;
- int commit;
- int read;
- int flags;
- /* Data points here */
- unsigned long data[];
-};
-
-/* Values for .flags field of tty_buffer */
-#define TTYB_NORMAL 1 /* buffer has no flags buffer */
-
-static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
-{
- return ((unsigned char *)b->data) + ofs;
-}
-
-static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
-{
- return (char *)char_buf_ptr(b, ofs) + b->size;
-}
-
-struct tty_bufhead {
- struct tty_buffer *head; /* Queue head */
- struct work_struct work;
- struct mutex lock;
- atomic_t priority;
- struct tty_buffer sentinel;
- struct llist_head free; /* Free queue head */
- atomic_t mem_used; /* In-use buffers excluding free list */
- int mem_limit;
- struct tty_buffer *tail; /* Active buffer */
-};
-/*
- * When a break, frame error, or parity error happens, these codes are
- * stuffed into the flags buffer.
- */
-#define TTY_NORMAL 0
-#define TTY_BREAK 1
-#define TTY_FRAME 2
-#define TTY_PARITY 3
-#define TTY_OVERRUN 4
-
#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
diff --git a/include/linux/tty_buffer.h b/include/linux/tty_buffer.h
new file mode 100644
index 000000000000..3b9d77604291
--- /dev/null
+++ b/include/linux/tty_buffer.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_TTY_BUFFER_H
+#define _LINUX_TTY_BUFFER_H
+
+#include <linux/atomic.h>
+#include <linux/llist.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+
+struct tty_buffer {
+ union {
+ struct tty_buffer *next;
+ struct llist_node free;
+ };
+ int used;
+ int size;
+ int commit;
+ int read;
+ int flags;
+ /* Data points here */
+ unsigned long data[];
+};
+
+/* Values for .flags field of tty_buffer */
+#define TTYB_NORMAL 1 /* buffer has no flags buffer */
+
+static inline unsigned char *char_buf_ptr(struct tty_buffer *b, int ofs)
+{
+ return ((unsigned char *)b->data) + ofs;
+}
+
+static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
+{
+ return (char *)char_buf_ptr(b, ofs) + b->size;
+}
+
+struct tty_bufhead {
+ struct tty_buffer *head; /* Queue head */
+ struct work_struct work;
+ struct mutex lock;
+ atomic_t priority;
+ struct tty_buffer sentinel;
+ struct llist_head free; /* Free queue head */
+ atomic_t mem_used; /* In-use buffers excluding free list */
+ int mem_limit;
+ struct tty_buffer *tail; /* Active buffer */
+};
+
+/*
+ * When a break, frame error, or parity error happens, these codes are
+ * stuffed into the flags buffer.
+ */
+#define TTY_NORMAL 0
+#define TTY_BREAK 1
+#define TTY_FRAME 2
+#define TTY_PARITY 3
+#define TTY_OVERRUN 4
+
+#endif
--
2.32.0
