Merge branch 'io_remap_pfn_range' of git://www.jni.nu/cris

[firefly-linux-kernel-4.4.55.git] / include / linux / tty.h

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 7802a243ee1372dfff07f1dd6c2b294abeddfb9c..1437da3ddc629b7dc285e7cb4ce11e2b5400de7a 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -13,6 +13,7 @@
 #include <linux/tty_driver.h>
 #include <linux/tty_ldisc.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 
 #include <asm/system.h>
 
@@ -179,6 +180,7 @@ struct tty_bufhead {
 #define L_FLUSHO(tty)  _L_FLAG((tty), FLUSHO)
 #define L_PENDIN(tty)  _L_FLAG((tty), PENDIN)
 #define L_IEXTEN(tty)  _L_FLAG((tty), IEXTEN)
+#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
 
 struct device;
 struct signal_struct;
@@ -415,6 +417,7 @@ extern int is_ignored(int sig);
 extern int tty_signal(int sig, struct tty_struct *tty);
 extern void tty_hangup(struct tty_struct *tty);
 extern void tty_vhangup(struct tty_struct *tty);
+extern void tty_vhangup_locked(struct tty_struct *tty);
 extern void tty_vhangup_self(void);
 extern void tty_unhangup(struct file *filp);
 extern int tty_hung_up_p(struct file *filp);
@@ -575,5 +578,54 @@ extern int vt_ioctl(struct tty_struct *tty, struct file *file,
 extern long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
                     unsigned int cmd, unsigned long arg);
 
+/* tty_mutex.c */
+/* functions for preparation of BKL removal */
+extern void __lockfunc tty_lock(void) __acquires(tty_lock);
+extern void __lockfunc tty_unlock(void) __releases(tty_lock);
+extern struct task_struct *__big_tty_mutex_owner;
+#define tty_locked()           (current == __big_tty_mutex_owner)
+
+/*
+ * wait_event_interruptible_tty -- wait for a condition with the tty lock held
+ *
+ * The condition we are waiting for might take a long time to
+ * become true, or might depend on another thread taking the
+ * BTM. In either case, we need to drop the BTM to guarantee
+ * forward progress. This is a leftover from the conversion
+ * from the BKL and should eventually get removed as the BTM
+ * falls out of use.
+ *
+ * Do not use in new code.
+ */
+#define wait_event_interruptible_tty(wq, condition)                    \
+({                                                                     \
+       int __ret = 0;                                                  \
+       if (!(condition)) {                                             \
+               __wait_event_interruptible_tty(wq, condition, __ret);   \
+       }                                                               \
+       __ret;                                                          \
+})
+
+#define __wait_event_interruptible_tty(wq, condition, ret)             \
+do {                                                                   \
+       DEFINE_WAIT(__wait);                                            \
+                                                                       \
+       for (;;) {                                                      \
+               prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);      \
+               if (condition)                                          \
+                       break;                                          \
+               if (!signal_pending(current)) {                         \
+                       tty_unlock();                                   \
+                       schedule();                                     \
+                       tty_lock();                                     \
+                       continue;                                       \
+               }                                                       \
+               ret = -ERESTARTSYS;                                     \
+               break;                                                  \
+       }                                                               \
+       finish_wait(&wq, &__wait);                                      \
+} while (0)
+
+
 #endif /* __KERNEL__ */
 #endif