Re: 2.6.15-rc1-mm1

[Richard Knutsson <ricknu-0@student.ltu.se>]

Hi

Andrew Morton wrote:

> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15-rc1/2.6.15-rc1-mm1
>  
Got a compiler-error:

 CC      drivers/serial/jsm/jsm_tty.o
drivers/serial/jsm/jsm_tty.c: In function `jsm_input':
drivers/serial/jsm/jsm_tty.c:592: error: structure has no member named `flip'
drivers/serial/jsm/jsm_tty.c:619: error: structure has no member named `flip'
drivers/serial/jsm/jsm_tty.c:620: error: structure has no member named `flip'
...

(in file drivers/serial/jsm/jsm_tty.c, line 592)
		flip_len = TTY_FLIPBUF_SIZE - tp->flip.count;

I could not find the patch but I tracked it to the change:


--- linux-2.6.15-rc1/include/linux/tty.h	2005-10-27 17:52:48.000000000 -0700
+++ devel/include/linux/tty.h	2005-11-17 00:55:12.000000000 -0800
@@ -74,8 +74,7 @@ struct screen_info {
	u16 vesapm_off;		/* 0x30 */
	u16 pages;		/* 0x32 */
	u16 vesa_attributes;	/* 0x34 */
-	u32  capabilities;      /* 0x36 */
-				/* 0x3a -- 0x3f reserved for future expansion */
+				/* 0x36 -- 0x3f reserved for future expansion */
};

extern struct screen_info screen_info;
@@ -121,16 +120,22 @@ extern struct screen_info screen_info;
 */
#define TTY_FLIPBUF_SIZE 512

-struct tty_flip_buffer {
+struct tty_buffer {
+	struct tty_buffer *next;
+	char *char_buf_ptr;
+	unsigned char *flag_buf_ptr;
+	int used;
+	int size;
+	/* Data points here */
+	unsigned long data[0];
+};
+
+struct tty_bufhead {
	struct work_struct		work;
	struct semaphore pty_sem;
-	char		*char_buf_ptr;
-	unsigned char	*flag_buf_ptr;
-	int		count;
-	int		buf_num;
-	unsigned char	char_buf[2*TTY_FLIPBUF_SIZE];
-	char		flag_buf[2*TTY_FLIPBUF_SIZE];
-	unsigned char	slop[4]; /* N.B. bug overwrites buffer by 1 */
+	struct tty_buffer *head;	/* Queue head */
+	struct tty_buffer *tail;	/* Active buffer */
+	struct tty_buffer *free;	/* Free queue head */
};
/*
 * The pty uses char_buf and flag_buf as a contiguous buffer
@@ -256,10 +261,11 @@ struct tty_struct {
	unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
	unsigned char low_latency:1, warned:1;
	unsigned char ctrl_status;
+	unsigned int receive_room;	/* Bytes free for queue */

	struct tty_struct *link;
	struct fasync_struct *fasync;
-	struct tty_flip_buffer flip;
+	struct tty_bufhead buf;
	int max_flip_cnt;
	int alt_speed;		/* For magic substitution of 38400 bps */
	wait_queue_head_t write_wait;

tty_flip_buffer have been split up to tty_buffer and tty_bufhead, so I do not know what the correct replacement for flip.count is.

/Richard Knutsson


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