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Diffstat (limited to 'include/linux/tty.h')
-rw-r--r--include/linux/tty.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 568369a86306..4409967db0c4 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -70,12 +70,13 @@ struct tty_buffer {
/*
* We default to dicing tty buffer allocations to this many characters
- * in order to avoid multiple page allocations. We assume tty_buffer itself
- * is under 256 bytes. See tty_buffer_find for the allocation logic this
- * must match
+ * in order to avoid multiple page allocations. We know the size of
+ * tty_buffer itself but it must also be taken into account that the
+ * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
+ * logic this must match
*/
-#define TTY_BUFFER_PAGE ((PAGE_SIZE - 256) / 2)
+#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
struct tty_bufhead {
@@ -223,6 +224,7 @@ struct tty_port {
wait_queue_head_t close_wait; /* Close waiters */
wait_queue_head_t delta_msr_wait; /* Modem status change */
unsigned long flags; /* TTY flags ASY_*/
+ unsigned char console:1; /* port is a console */
struct mutex mutex; /* Locking */
struct mutex buf_mutex; /* Buffer alloc lock */
unsigned char *xmit_buf; /* Optional buffer */