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-rw-r--r--include/linux/tty.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 6abfcf5b588..d96e5882f12 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;