tty: Halve flip buffer GFP_ATOMIC memory consumption

[android-x86/kernel.git] / include / linux / tty.h

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 97d660e..ad98b43 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -39,10 +39,14 @@ struct tty_buffer {
        int size;
        int commit;
        int read;
+       int flags;
        /* Data points here */
        unsigned long data[0];
 };
 
+/* 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;
@@ -60,7 +64,8 @@ struct tty_bufhead {
        atomic_t           priority;
        struct tty_buffer sentinel;
        struct llist_head free;         /* Free queue head */
-       atomic_t           memory_used; /* In-use buffers excluding free list */
+       atomic_t           mem_used;    /* In-use buffers excluding free list */
+       int                mem_limit;
        struct tty_buffer *tail;        /* Active buffer */
 };
 /*