mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
d4d13ff3ac
There is no reason to have tty_buffer::data typed as unsigned long. Switch to u8, but preserve the ulong alignment using __aligned. This allows for the cast removal from char_buf_ptr(). And for use of struct_size() in the allocation in tty_buffer_alloc() -- in the next patch. Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20230816105530.3335-2-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_TTY_BUFFER_H
|
|
#define _LINUX_TTY_BUFFER_H
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/llist.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
struct tty_buffer {
|
|
union {
|
|
struct tty_buffer *next;
|
|
struct llist_node free;
|
|
};
|
|
unsigned int used;
|
|
unsigned int size;
|
|
unsigned int commit;
|
|
unsigned int lookahead; /* Lazy update on recv, can become less than "read" */
|
|
unsigned int read;
|
|
bool flags;
|
|
/* Data points here */
|
|
u8 data[] __aligned(sizeof(unsigned long));
|
|
};
|
|
|
|
static inline u8 *char_buf_ptr(struct tty_buffer *b, unsigned int ofs)
|
|
{
|
|
return b->data + ofs;
|
|
}
|
|
|
|
static inline u8 *flag_buf_ptr(struct tty_buffer *b, unsigned int ofs)
|
|
{
|
|
return char_buf_ptr(b, ofs) + b->size;
|
|
}
|
|
|
|
struct tty_bufhead {
|
|
struct tty_buffer *head; /* Queue head */
|
|
struct work_struct work;
|
|
struct mutex lock;
|
|
atomic_t priority;
|
|
struct tty_buffer sentinel;
|
|
struct llist_head free; /* Free queue head */
|
|
atomic_t mem_used; /* In-use buffers excluding free list */
|
|
int mem_limit;
|
|
struct tty_buffer *tail; /* Active buffer */
|
|
};
|
|
|
|
/*
|
|
* When a break, frame error, or parity error happens, these codes are
|
|
* stuffed into the flags buffer.
|
|
*/
|
|
#define TTY_NORMAL 0
|
|
#define TTY_BREAK 1
|
|
#define TTY_FRAME 2
|
|
#define TTY_PARITY 3
|
|
#define TTY_OVERRUN 4
|
|
|
|
#endif
|