swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
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- v5.8
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- v5.14
- v5.13-rc7
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- v5.12
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- v5.11
- v5.10-rc7
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- v5.1
- v5.0-rc8
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- v5.0
- v4.9-rc8
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- v4.1-rc8
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- v4.1
- v4.0-rc7
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- v4.0
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- v3.7-rc2
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- v3.7
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- v3.6-rc6
- v3.6-rc5
- v3.6-rc4
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- v3.6-rc2
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- v3.6
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- v3.5-rc4
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- v3.2-rc4
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- v3.2-rc1
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- v3.11-rc2
- v3.11-rc1
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- v3.10-rc6
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- v3.10
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- v3.0
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- v2.6.39-rc1
- v2.6.39
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- v2.6.38
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- v2.6.37-rc4
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- v2.6.37-rc2
- v2.6.37-rc1
- v2.6.37
- v2.6.36-rc8
- v2.6.36-rc7
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- v2.6.36
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- v2.6.35
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- v2.6.34
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- v2.6.33
- v2.6.32-rc8
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- v2.6.32
- v2.6.31-rc9
- v2.6.31-rc8
- v2.6.31-rc7
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- v2.6.31
- v2.6.30-rc8
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- v2.6.30
- v2.6.29-rc8
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- v2.6.26-rc9
- v2.6.26-rc8
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- v2.6.25-rc9
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Tip revision: 9e1ff307c779ce1f0f810c7ecce3d95bbae40896 authored by Linus Torvalds on 03 October 2021, 21:08:47 UTC
Linux 5.15-rc4
Linux 5.15-rc4
Tip revision: 9e1ff30
tty_buffer.h
/* 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;
};
int used;
int size;
int commit;
int read;
int flags;
/* Data points here */
unsigned long data[];
};
/* 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;
}
static inline char *flag_buf_ptr(struct tty_buffer *b, int ofs)
{
return (char *)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