summaryrefslogtreecommitdiff
path: root/include/linux
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/Kbuild3
-rw-r--r--include/linux/a.out.h8
-rw-r--r--include/linux/agp_backend.h16
-rw-r--r--include/linux/agpgart.h4
-rw-r--r--include/linux/audit.h2
-rw-r--r--include/linux/bootmem.h2
-rw-r--r--include/linux/capability.h2
-rw-r--r--include/linux/cfag12864b.h2
-rw-r--r--include/linux/console.h2
-rw-r--r--include/linux/cpumask.h4
-rw-r--r--include/linux/dcache.h2
-rw-r--r--include/linux/debug_locks.h10
-rw-r--r--include/linux/firmware.h2
-rw-r--r--include/linux/fs.h3
-rw-r--r--include/linux/i2c.h2
-rw-r--r--include/linux/if_tunnel.h2
-rw-r--r--include/linux/inet_lro.h6
-rw-r--r--include/linux/input.h2
-rw-r--r--include/linux/kernel.h3
-rw-r--r--include/linux/ks0108.h2
-rw-r--r--include/linux/kvm_host.h1
-rw-r--r--include/linux/netdevice.h4
-rw-r--r--include/linux/page-flags.h1
-rw-r--r--include/linux/pci_ids.h1
-rw-r--r--include/linux/rculist.h6
-rw-r--r--include/linux/resume-trace.h2
-rw-r--r--include/linux/securebits.h15
-rw-r--r--include/linux/slab.h2
-rw-r--r--include/linux/slub_def.h4
-rw-r--r--include/linux/thermal.h6
-rw-r--r--include/linux/tty_driver.h5
31 files changed, 67 insertions, 59 deletions
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 93b98856007a..71d70d1fbce2 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -166,6 +166,9 @@ unifdef-y += acct.h
unifdef-y += adb.h
unifdef-y += adfs_fs.h
unifdef-y += agpgart.h
+ifneq ($(wildcard $(srctree)/include/asm-$(SRCARCH)/a.out.h),)
+unifdef-y += a.out.h
+endif
unifdef-y += apm_bios.h
unifdef-y += atalk.h
unifdef-y += atmdev.h
diff --git a/include/linux/a.out.h b/include/linux/a.out.h
index 208f4e8ed304..e86dfca44589 100644
--- a/include/linux/a.out.h
+++ b/include/linux/a.out.h
@@ -1,8 +1,6 @@
#ifndef __A_OUT_GNU_H__
#define __A_OUT_GNU_H__
-#ifdef CONFIG_ARCH_SUPPORTS_AOUT
-
#define __GNU_EXEC_MACROS__
#ifndef __STRUCT_EXEC_OVERRIDE__
@@ -277,10 +275,4 @@ struct relocation_info
#endif /* no N_RELOCATION_INFO_DECLARED. */
#endif /*__ASSEMBLY__ */
-#else /* CONFIG_ARCH_SUPPORTS_AOUT */
-#ifndef __ASSEMBLY__
-struct exec {
-};
-#endif
-#endif /* CONFIG_ARCH_SUPPORTS_AOUT */
#endif /* __A_OUT_GNU_H__ */
diff --git a/include/linux/agp_backend.h b/include/linux/agp_backend.h
index 661d90d6cf7c..972b12bcfb36 100644
--- a/include/linux/agp_backend.h
+++ b/include/linux/agp_backend.h
@@ -30,14 +30,6 @@
#ifndef _AGP_BACKEND_H
#define _AGP_BACKEND_H 1
-#ifndef TRUE
-#define TRUE 1
-#endif
-
-#ifndef FALSE
-#define FALSE 0
-#endif
-
enum chipset_type {
NOT_SUPPORTED,
SUPPORTED,
@@ -57,7 +49,7 @@ struct agp_kern_info {
size_t aper_size;
int max_memory; /* In pages */
int current_memory;
- int cant_use_aperture;
+ bool cant_use_aperture;
unsigned long page_mask;
struct vm_operations_struct *vm_ops;
};
@@ -83,9 +75,9 @@ struct agp_memory {
off_t pg_start;
u32 type;
u32 physical;
- u8 is_bound;
- u8 is_flushed;
- u8 vmalloc_flag;
+ bool is_bound;
+ bool is_flushed;
+ bool vmalloc_flag;
};
#define AGP_NORMAL_MEMORY 0
diff --git a/include/linux/agpgart.h b/include/linux/agpgart.h
index 62aef589eb94..c8fdb6e658e1 100644
--- a/include/linux/agpgart.h
+++ b/include/linux/agpgart.h
@@ -206,8 +206,8 @@ struct agp_front_data {
struct agp_controller *current_controller;
struct agp_controller *controllers;
struct agp_file_private *file_priv_list;
- u8 used_by_controller;
- u8 backend_acquired;
+ bool used_by_controller;
+ bool backend_acquired;
};
#endif /* __KERNEL__ */
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 63c3bb98558f..8b82974bdc12 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -571,7 +571,7 @@ extern void audit_log_lost(const char *message);
extern int audit_update_lsm_rules(void);
/* Private API (for audit.c only) */
-extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
+extern int audit_filter_user(struct netlink_skb_parms *cb);
extern int audit_filter_type(int type);
extern int audit_receive_filter(int type, int pid, int uid, int seq,
void *data, size_t datasz, uid_t loginuid,
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 6a5dbdc8a7dc..686895bacd9d 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -94,7 +94,7 @@ extern unsigned long init_bootmem_node(pg_data_t *pgdat,
unsigned long freepfn,
unsigned long startpfn,
unsigned long endpfn);
-extern void reserve_bootmem_node(pg_data_t *pgdat,
+extern int reserve_bootmem_node(pg_data_t *pgdat,
unsigned long physaddr,
unsigned long size,
int flags);
diff --git a/include/linux/capability.h b/include/linux/capability.h
index fa830f8de032..02673846d205 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -501,6 +501,8 @@ extern const kernel_cap_t __cap_empty_set;
extern const kernel_cap_t __cap_full_set;
extern const kernel_cap_t __cap_init_eff_set;
+kernel_cap_t cap_set_effective(const kernel_cap_t pE_new);
+
int capable(int cap);
int __capable(struct task_struct *t, int cap);
diff --git a/include/linux/cfag12864b.h b/include/linux/cfag12864b.h
index 1605dd8aa646..6f9f19d66591 100644
--- a/include/linux/cfag12864b.h
+++ b/include/linux/cfag12864b.h
@@ -4,7 +4,7 @@
* Description: cfag12864b LCD driver header
* License: GPLv2
*
- * Author: Copyright (C) Miguel Ojeda Sandonis <maxextreme@gmail.com>
+ * Author: Copyright (C) Miguel Ojeda Sandonis
* Date: 2006-10-12
*
* This program is free software; you can redistribute it and/or modify
diff --git a/include/linux/console.h b/include/linux/console.h
index a4f27fbdf549..248e6e3b9b73 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -108,6 +108,8 @@ struct console {
struct console *next;
};
+extern int console_set_on_cmdline;
+
extern int add_preferred_console(char *name, int idx, char *options);
extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options);
extern void register_console(struct console *);
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 5df3db58fcc6..c24875bd9c5b 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -353,6 +353,10 @@ static inline void __cpus_fold(cpumask_t *dstp, const cpumask_t *origp,
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
#endif /* NR_CPUS */
+#define next_cpu_nr(n, src) next_cpu(n, src)
+#define cpus_weight_nr(cpumask) cpus_weight(cpumask)
+#define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
+
/*
* The following particular system cpumasks and operations manage
* possible, present and online cpus. Each of them is a fixed size
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 2a6639407c80..d982eb89c77d 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -300,7 +300,7 @@ extern int d_validate(struct dentry *, struct dentry *);
extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...);
extern char *__d_path(const struct path *path, struct path *root, char *, int);
-extern char *d_path(struct path *, char *, int);
+extern char *d_path(const struct path *, char *, int);
extern char *dentry_path(struct dentry *, char *, int);
/* Allocation counts.. */
diff --git a/include/linux/debug_locks.h b/include/linux/debug_locks.h
index f4a5871767f5..4aaa4afb1cb9 100644
--- a/include/linux/debug_locks.h
+++ b/include/linux/debug_locks.h
@@ -1,6 +1,8 @@
#ifndef __LINUX_DEBUG_LOCKING_H
#define __LINUX_DEBUG_LOCKING_H
+#include <linux/kernel.h>
+
struct task_struct;
extern int debug_locks;
@@ -11,14 +13,6 @@ extern int debug_locks_silent;
*/
extern int debug_locks_off(void);
-/*
- * In the debug case we carry the caller's instruction pointer into
- * other functions, but we dont want the function argument overhead
- * in the nondebug case - hence these macros:
- */
-#define _RET_IP_ (unsigned long)__builtin_return_address(0)
-#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
-
#define DEBUG_LOCKS_WARN_ON(c) \
({ \
int __ret = 0; \
diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index 4d10c7328d2d..6c7eff2ebada 100644
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -13,7 +13,7 @@ struct firmware {
struct device;
-#if defined(CONFIG_FW_LOADER) || defined(CONFIG_FW_LOADER_MODULE)
+#if defined(CONFIG_FW_LOADER) || (defined(CONFIG_FW_LOADER_MODULE) && defined(MODULE))
int request_firmware(const struct firmware **fw, const char *name,
struct device *device);
int request_firmware_nowait(
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d490779f18d9..d8e2762ed14d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -83,6 +83,7 @@ extern int dir_notify_enable;
#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
#define READ_META (READ | (1 << BIO_RW_META))
#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
+#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
#define SEL_IN 1
@@ -894,8 +895,6 @@ static inline int file_check_writeable(struct file *filp)
typedef struct files_struct *fl_owner_t;
struct file_lock_operations {
- void (*fl_insert)(struct file_lock *); /* lock insertion callback */
- void (*fl_remove)(struct file_lock *); /* lock removal callback */
void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
void (*fl_release_private)(struct file_lock *);
};
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fb9af6a0fe9c..8dc730132192 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -171,7 +171,7 @@ struct i2c_client {
struct i2c_adapter *adapter; /* the adapter we sit on */
struct i2c_driver *driver; /* and our access routines */
struct device dev; /* the device structure */
- int irq; /* irq issued by device (or -1) */
+ int irq; /* irq issued by device */
struct list_head list; /* DEPRECATED */
struct completion released;
};
diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index f1fbe9c930d7..d4efe4014705 100644
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -41,7 +41,7 @@ struct ip_tunnel_prl {
__u16 __reserved;
__u32 datalen;
__u32 __reserved2;
- void __user *data;
+ /* data follows */
};
/* PRL flags */
diff --git a/include/linux/inet_lro.h b/include/linux/inet_lro.h
index 80335b7d77c5..c4335faebb63 100644
--- a/include/linux/inet_lro.h
+++ b/include/linux/inet_lro.h
@@ -84,7 +84,11 @@ struct net_lro_mgr {
from received packets and eth protocol
is still ETH_P_8021Q */
- u32 ip_summed; /* Set in non generated SKBs in page mode */
+ /*
+ * Set for generated SKBs that are not added to
+ * the frag list in fragmented mode
+ */
+ u32 ip_summed;
u32 ip_summed_aggr; /* Set in aggregated SKBs: CHECKSUM_UNNECESSARY
* or CHECKSUM_NONE */
diff --git a/include/linux/input.h b/include/linux/input.h
index e075c4b762fb..d150c57e5f0a 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -534,8 +534,8 @@ struct input_absinfo {
#define KEY_FRAMEBACK 0x1b4 /* Consumer - transport controls */
#define KEY_FRAMEFORWARD 0x1b5
-
#define KEY_CONTEXT_MENU 0x1b6 /* GenDesc - system context menu */
+#define KEY_MEDIA_REPEAT 0x1b7 /* Consumer - transport control */
#define KEY_DEL_EOL 0x1c0
#define KEY_DEL_EOS 0x1c1
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 792bf0aa779b..2e70006c7fa8 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -46,6 +46,9 @@ extern const char linux_proc_banner[];
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
+#define _RET_IP_ (unsigned long)__builtin_return_address(0)
+#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
+
#ifdef CONFIG_LBD
# include <asm/div64.h>
# define sector_div(a, b) do_div(a, b)
diff --git a/include/linux/ks0108.h b/include/linux/ks0108.h
index a2c54acceb4e..cb311798e0bc 100644
--- a/include/linux/ks0108.h
+++ b/include/linux/ks0108.h
@@ -4,7 +4,7 @@
* Description: ks0108 LCD Controller driver header
* License: GPLv2
*
- * Author: Copyright (C) Miguel Ojeda Sandonis <maxextreme@gmail.com>
+ * Author: Copyright (C) Miguel Ojeda Sandonis
* Date: 2006-10-31
*
* This program is free software; you can redistribute it and/or modify
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 092b1b25291d..de9d1df4bba2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -33,6 +33,7 @@
#define KVM_REQ_REPORT_TPR_ACCESS 2
#define KVM_REQ_MMU_RELOAD 3
#define KVM_REQ_TRIPLE_FAULT 4
+#define KVM_REQ_PENDING_TIMER 5
struct kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f27fd2009334..25f87102ab66 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -88,6 +88,8 @@ struct wireless_dev;
#define NETDEV_TX_BUSY 1 /* driver tx path was busy*/
#define NETDEV_TX_LOCKED -1 /* driver tx lock was already taken */
+#ifdef __KERNEL__
+
/*
* Compute the worst case header length according to the protocols
* used.
@@ -114,6 +116,8 @@ struct wireless_dev;
#define MAX_HEADER (LL_MAX_HEADER + 48)
#endif
+#endif /* __KERNEL__ */
+
struct net_device_subqueue
{
/* Give a control state for each queue. This struct may contain
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index f31debfac926..0d2a4e7012aa 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -157,6 +157,7 @@ PAGEFLAG(Active, active) __CLEARPAGEFLAG(Active, active)
__PAGEFLAG(Slab, slab)
PAGEFLAG(Checked, owner_priv_1) /* Used by some filesystems */
PAGEFLAG(Pinned, owner_priv_1) TESTSCFLAG(Pinned, owner_priv_1) /* Xen */
+PAGEFLAG(SavePinned, dirty); /* Xen */
PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
__SETPAGEFLAG(Private, private)
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index eafc9d6d2b35..65953822c9cb 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -1520,6 +1520,7 @@
#define PCI_DEVICE_ID_MARVELL_GT64260 0x6430
#define PCI_DEVICE_ID_MARVELL_MV64360 0x6460
#define PCI_DEVICE_ID_MARVELL_MV64460 0x6480
+#define PCI_DEVICE_ID_MARVELL_CAFE_SD 0x4101
#define PCI_VENDOR_ID_V3 0x11b0
#define PCI_DEVICE_ID_V3_V960 0x0001
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
new file mode 100644
index 000000000000..bde4586f4382
--- /dev/null
+++ b/include/linux/rculist.h
@@ -0,0 +1,6 @@
+#ifndef _LINUX_RCULIST_H
+#define _LINUX_RCULIST_H
+
+#include <linux/list.h>
+
+#endif /* _LINUX_RCULIST_H */
diff --git a/include/linux/resume-trace.h b/include/linux/resume-trace.h
index f3f4f28c6960..c9ba2fdf807d 100644
--- a/include/linux/resume-trace.h
+++ b/include/linux/resume-trace.h
@@ -8,7 +8,7 @@ extern int pm_trace_enabled;
struct device;
extern void set_trace_device(struct device *);
-extern void generate_resume_trace(void *tracedata, unsigned int user);
+extern void generate_resume_trace(const void *tracedata, unsigned int user);
#define TRACE_DEVICE(dev) do { \
if (pm_trace_enabled) \
diff --git a/include/linux/securebits.h b/include/linux/securebits.h
index c1f19dbceb05..92f09bdf1175 100644
--- a/include/linux/securebits.h
+++ b/include/linux/securebits.h
@@ -7,14 +7,15 @@
inheritance of root-permissions and suid-root executable under
compatibility mode. We raise the effective and inheritable bitmasks
*of the executable file* if the effective uid of the new process is
- 0. If the real uid is 0, we raise the inheritable bitmask of the
+ 0. If the real uid is 0, we raise the effective (legacy) bit of the
executable file. */
#define SECURE_NOROOT 0
#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */
-/* When set, setuid to/from uid 0 does not trigger capability-"fixes"
- to be compatible with old programs relying on set*uid to loose
- privileges. When unset, setuid doesn't change privileges. */
+/* When set, setuid to/from uid 0 does not trigger capability-"fixup".
+ When unset, to provide compatiblility with old programs relying on
+ set*uid to gain/lose privilege, transitions to/from uid 0 cause
+ capabilities to be gained/lost. */
#define SECURE_NO_SETUID_FIXUP 2
#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */
@@ -26,10 +27,10 @@
#define SECURE_KEEP_CAPS 4
#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */
-/* Each securesetting is implemented using two bits. One bit specify
+/* Each securesetting is implemented using two bits. One bit specifies
whether the setting is on or off. The other bit specify whether the
- setting is fixed or not. A setting which is fixed cannot be changed
- from user-level. */
+ setting is locked or not. A setting which is locked cannot be
+ changed from user-level. */
#define issecure_mask(X) (1 << (X))
#define issecure(X) (issecure_mask(X) & current->securebits)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index c2ad35016599..9aa90a6f20e0 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -1,7 +1,7 @@
/*
* Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
*
- * (C) SGI 2006, Christoph Lameter <clameter@sgi.com>
+ * (C) SGI 2006, Christoph Lameter
* Cleaned up and restructured to ease the addition of alternative
* implementations of SLAB allocators.
*/
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 71e43a12ebbb..d117ea2825a9 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -4,7 +4,7 @@
/*
* SLUB : A Slab allocator without object queues.
*
- * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com>
+ * (C) 2007 SGI, Christoph Lameter
*/
#include <linux/types.h>
#include <linux/gfp.h>
@@ -137,10 +137,12 @@ static __always_inline int kmalloc_index(size_t size)
if (size <= KMALLOC_MIN_SIZE)
return KMALLOC_SHIFT_LOW;
+#if KMALLOC_MIN_SIZE <= 64
if (size > 64 && size <= 96)
return 1;
if (size > 128 && size <= 192)
return 2;
+#endif
if (size <= 8) return 3;
if (size <= 16) return 4;
if (size <= 32) return 5;
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 06d3e6eb9ca8..917707e6151d 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -66,8 +66,7 @@ struct thermal_cooling_device {
((long)t-2732+5)/10 : ((long)t-2732-5)/10)
#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
-#if defined(CONFIG_HWMON) || \
- (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
+#if defined(CONFIG_THERMAL_HWMON)
/* thermal zone devices with the same type share one hwmon device */
struct thermal_hwmon_device {
char type[THERMAL_NAME_LENGTH];
@@ -94,8 +93,7 @@ struct thermal_zone_device {
struct idr idr;
struct mutex lock; /* protect cooling devices list */
struct list_head node;
-#if defined(CONFIG_HWMON) || \
- (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
+#if defined(CONFIG_THERMAL_HWMON)
struct list_head hwmon_node;
struct thermal_hwmon_device *hwmon;
struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 59f1c0bd8f9c..d2a003586761 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -27,8 +27,7 @@
* This routine is called by the kernel to write a series of
* characters to the tty device. The characters may come from
* user space or kernel space. This routine will return the
- * number of characters actually accepted for writing. This
- * routine is mandatory.
+ * number of characters actually accepted for writing.
*
* Optional: Required for writable devices.
*
@@ -134,7 +133,7 @@
* This routine notifies the tty driver that it should hangup the
* tty device.
*
- * Required:
+ * Optional:
*
* void (*break_ctl)(struct tty_stuct *tty, int state);
*