3958 static void clear_buffer(struct st_buffer * st_bp)  in clear_buffer()  argument
3962 	for (i=0; i < st_bp->frp_segs; i++)  in clear_buffer()
3963 		memset(page_address(st_bp->reserved_pages[i]), 0,  in clear_buffer()
3964 		       PAGE_SIZE << st_bp->reserved_page_order);  in clear_buffer()
3965 	st_bp->cleared = 1;  in clear_buffer()
3987 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)  in append_to_buffer()  argument
3990 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in append_to_buffer()
3992 	for (i = 0, offset = st_bp->buffer_bytes;  in append_to_buffer()
3993 	     i < st_bp->frp_segs && offset >= length; i++)  in append_to_buffer()
3995 	if (i == st_bp->frp_segs) {	/* Should never happen */  in append_to_buffer()
3999 	for (; i < st_bp->frp_segs && do_count > 0; i++) {  in append_to_buffer()
4000 		struct page *page = st_bp->reserved_pages[i];  in append_to_buffer()
4006 		st_bp->buffer_bytes += cnt;  in append_to_buffer()
4019 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)  in from_buffer()  argument
4022 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in from_buffer()
4024 	for (i = 0, offset = st_bp->read_pointer;  in from_buffer()
4025 	     i < st_bp->frp_segs && offset >= length; i++)  in from_buffer()
4027 	if (i == st_bp->frp_segs) {	/* Should never happen */  in from_buffer()
4031 	for (; i < st_bp->frp_segs && do_count > 0; i++) {  in from_buffer()
4032 		struct page *page = st_bp->reserved_pages[i];  in from_buffer()
4038 		st_bp->buffer_bytes -= cnt;  in from_buffer()
4039 		st_bp->read_pointer += cnt;  in from_buffer()
4051 static void move_buffer_data(struct st_buffer * st_bp, int offset)  in move_buffer_data()  argument
4055 	int length = PAGE_SIZE << st_bp->reserved_page_order;  in move_buffer_data()
4060 	total=st_bp->buffer_bytes - offset;  in move_buffer_data()
4061 	for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {  in move_buffer_data()
4068 	st_bp->buffer_bytes = st_bp->read_pointer = total;  in move_buffer_data()
4070 		struct page *dpage = st_bp->reserved_pages[dst_seg];  in move_buffer_data()
4071 		struct page *spage = st_bp->reserved_pages[src_seg];  in move_buffer_data()