1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 6abfcf5b5887..d96e5882f129 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -68,6 +68,16 @@ struct tty_buffer {
         unsigned long data[0];
 };
 
+/*
+ * 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
+ */
+
+#define TTY_BUFFER_PAGE         ((PAGE_SIZE  - 256) / 2)
+
+
 struct tty_bufhead {
         struct delayed_work work;
         spinlock_t lock;