[PATCH] sysrq cleanup
sysrq.c is fairly revolting. Fix. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton
Linus Torvalds
Родитель
21e4f95269
Коммит
bf36b9011e
|
|
@ -42,16 +42,15 @@
|
|||
/* Whether we react on sysrq keys or just ignore them */
|
||||
int sysrq_enabled = 1;
|
||||
|
||||
/* Loglevel sysrq handler */
|
||||
static void sysrq_handle_loglevel(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
int i;
|
||||
i = key - '0';
|
||||
console_loglevel = 7;
|
||||
printk("Loglevel set to %d\n", i);
|
||||
console_loglevel = i;
|
||||
}
|
||||
}
|
||||
static struct sysrq_key_op sysrq_loglevel_op = {
|
||||
.handler = sysrq_handle_loglevel,
|
||||
.help_msg = "loglevel0-8",
|
||||
|
|
@ -59,11 +58,9 @@ static struct sysrq_key_op sysrq_loglevel_op = {
|
|||
.enable_mask = SYSRQ_ENABLE_LOG,
|
||||
};
|
||||
|
||||
|
||||
/* SAK sysrq handler */
|
||||
#ifdef CONFIG_VT
|
||||
static void sysrq_handle_SAK(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
if (tty)
|
||||
do_SAK(tty);
|
||||
|
|
@ -75,12 +72,13 @@ static struct sysrq_key_op sysrq_SAK_op = {
|
|||
.action_msg = "SAK",
|
||||
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
|
||||
};
|
||||
#else
|
||||
#define sysrq_SAK_op (*(struct sysrq_key_op *)0)
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_VT
|
||||
/* unraw sysrq handler */
|
||||
static void sysrq_handle_unraw(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
struct kbd_struct *kbd = &kbd_table[fg_console];
|
||||
|
||||
|
|
@ -93,10 +91,11 @@ static struct sysrq_key_op sysrq_unraw_op = {
|
|||
.action_msg = "Keyboard mode set to XLATE",
|
||||
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
|
||||
};
|
||||
#else
|
||||
#define sysrq_unraw_op (*(struct sysrq_key_op *)0)
|
||||
#endif /* CONFIG_VT */
|
||||
|
||||
#ifdef CONFIG_KEXEC
|
||||
/* crashdump sysrq handler */
|
||||
static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
|
|
@ -108,16 +107,16 @@ static struct sysrq_key_op sysrq_crashdump_op = {
|
|||
.action_msg = "Trigger a crashdump",
|
||||
.enable_mask = SYSRQ_ENABLE_DUMP,
|
||||
};
|
||||
#else
|
||||
#define sysrq_crashdump_op (*(struct sysrq_key_op *)0)
|
||||
#endif
|
||||
|
||||
/* reboot sysrq handler */
|
||||
static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
local_irq_enable();
|
||||
emergency_restart();
|
||||
}
|
||||
|
||||
static struct sysrq_key_op sysrq_reboot_op = {
|
||||
.handler = sysrq_handle_reboot,
|
||||
.help_msg = "reBoot",
|
||||
|
|
@ -126,11 +125,10 @@ static struct sysrq_key_op sysrq_reboot_op = {
|
|||
};
|
||||
|
||||
static void sysrq_handle_sync(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
emergency_sync();
|
||||
}
|
||||
|
||||
static struct sysrq_key_op sysrq_sync_op = {
|
||||
.handler = sysrq_handle_sync,
|
||||
.help_msg = "Sync",
|
||||
|
|
@ -139,11 +137,10 @@ static struct sysrq_key_op sysrq_sync_op = {
|
|||
};
|
||||
|
||||
static void sysrq_handle_mountro(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
emergency_remount();
|
||||
}
|
||||
|
||||
static struct sysrq_key_op sysrq_mountro_op = {
|
||||
.handler = sysrq_handle_mountro,
|
||||
.help_msg = "Unmount",
|
||||
|
|
@ -151,28 +148,23 @@ static struct sysrq_key_op sysrq_mountro_op = {
|
|||
.enable_mask = SYSRQ_ENABLE_REMOUNT,
|
||||
};
|
||||
|
||||
/* END SYNC SYSRQ HANDLERS BLOCK */
|
||||
|
||||
#ifdef CONFIG_DEBUG_MUTEXES
|
||||
|
||||
static void
|
||||
sysrq_handle_showlocks(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
|
||||
static void sysrq_handle_showlocks(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
mutex_debug_show_all_locks();
|
||||
}
|
||||
|
||||
static struct sysrq_key_op sysrq_showlocks_op = {
|
||||
.handler = sysrq_handle_showlocks,
|
||||
.help_msg = "show-all-locks(D)",
|
||||
.action_msg = "Show Locks Held",
|
||||
};
|
||||
|
||||
#else
|
||||
#define sysrq_showlocks_op (*(struct sysrq_key_op *)0)
|
||||
#endif
|
||||
|
||||
/* SHOW SYSRQ HANDLERS BLOCK */
|
||||
|
||||
static void sysrq_handle_showregs(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
if (pt_regs)
|
||||
show_regs(pt_regs);
|
||||
|
|
@ -184,9 +176,8 @@ static struct sysrq_key_op sysrq_showregs_op = {
|
|||
.enable_mask = SYSRQ_ENABLE_DUMP,
|
||||
};
|
||||
|
||||
|
||||
static void sysrq_handle_showstate(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
show_state();
|
||||
}
|
||||
|
|
@ -197,9 +188,8 @@ static struct sysrq_key_op sysrq_showstate_op = {
|
|||
.enable_mask = SYSRQ_ENABLE_DUMP,
|
||||
};
|
||||
|
||||
|
||||
static void sysrq_handle_showmem(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
show_mem();
|
||||
}
|
||||
|
|
@ -210,13 +200,9 @@ static struct sysrq_key_op sysrq_showmem_op = {
|
|||
.enable_mask = SYSRQ_ENABLE_DUMP,
|
||||
};
|
||||
|
||||
/* SHOW SYSRQ HANDLERS BLOCK */
|
||||
|
||||
|
||||
/* SIGNAL SYSRQ HANDLERS BLOCK */
|
||||
|
||||
/* signal sysrq helper function
|
||||
* Sends a signal to all user processes */
|
||||
/*
|
||||
* Signal sysrq helper function. Sends a signal to all user processes.
|
||||
*/
|
||||
static void send_sig_all(int sig)
|
||||
{
|
||||
struct task_struct *p;
|
||||
|
|
@ -229,7 +215,7 @@ static void send_sig_all(int sig)
|
|||
}
|
||||
|
||||
static void sysrq_handle_term(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
send_sig_all(SIGTERM);
|
||||
console_loglevel = 8;
|
||||
|
|
@ -243,7 +229,8 @@ static struct sysrq_key_op sysrq_term_op = {
|
|||
|
||||
static void moom_callback(void *ignored)
|
||||
{
|
||||
out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL], GFP_KERNEL, 0);
|
||||
out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL],
|
||||
GFP_KERNEL, 0);
|
||||
}
|
||||
|
||||
static DECLARE_WORK(moom_work, moom_callback, NULL);
|
||||
|
|
@ -260,7 +247,7 @@ static struct sysrq_key_op sysrq_moom_op = {
|
|||
};
|
||||
|
||||
static void sysrq_handle_kill(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
send_sig_all(SIGKILL);
|
||||
console_loglevel = 8;
|
||||
|
|
@ -272,8 +259,6 @@ static struct sysrq_key_op sysrq_kill_op = {
|
|||
.enable_mask = SYSRQ_ENABLE_SIGNAL,
|
||||
};
|
||||
|
||||
/* END SIGNAL SYSRQ HANDLERS BLOCK */
|
||||
|
||||
static void sysrq_handle_unrt(int key, struct pt_regs *pt_regs,
|
||||
struct tty_struct *tty)
|
||||
{
|
||||
|
|
@ -288,110 +273,99 @@ static struct sysrq_key_op sysrq_unrt_op = {
|
|||
|
||||
/* Key Operations table and lock */
|
||||
static DEFINE_SPINLOCK(sysrq_key_table_lock);
|
||||
#define SYSRQ_KEY_TABLE_LENGTH 36
|
||||
static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
|
||||
/* 0 */ &sysrq_loglevel_op,
|
||||
/* 1 */ &sysrq_loglevel_op,
|
||||
/* 2 */ &sysrq_loglevel_op,
|
||||
/* 3 */ &sysrq_loglevel_op,
|
||||
/* 4 */ &sysrq_loglevel_op,
|
||||
/* 5 */ &sysrq_loglevel_op,
|
||||
/* 6 */ &sysrq_loglevel_op,
|
||||
/* 7 */ &sysrq_loglevel_op,
|
||||
/* 8 */ &sysrq_loglevel_op,
|
||||
/* 9 */ &sysrq_loglevel_op,
|
||||
/* a */ NULL, /* Don't use for system provided sysrqs,
|
||||
it is handled specially on the sparc
|
||||
and will never arrive */
|
||||
/* b */ &sysrq_reboot_op,
|
||||
#ifdef CONFIG_KEXEC
|
||||
/* c */ &sysrq_crashdump_op,
|
||||
#else
|
||||
/* c */ NULL,
|
||||
#endif
|
||||
#ifdef CONFIG_DEBUG_MUTEXES
|
||||
/* d */ &sysrq_showlocks_op,
|
||||
#else
|
||||
/* d */ NULL,
|
||||
#endif
|
||||
/* e */ &sysrq_term_op,
|
||||
/* f */ &sysrq_moom_op,
|
||||
/* g */ NULL,
|
||||
/* h */ NULL,
|
||||
/* i */ &sysrq_kill_op,
|
||||
/* j */ NULL,
|
||||
#ifdef CONFIG_VT
|
||||
/* k */ &sysrq_SAK_op,
|
||||
#else
|
||||
/* k */ NULL,
|
||||
#endif
|
||||
/* l */ NULL,
|
||||
/* m */ &sysrq_showmem_op,
|
||||
/* n */ &sysrq_unrt_op,
|
||||
/* o */ NULL, /* This will often be registered
|
||||
as 'Off' at init time */
|
||||
/* p */ &sysrq_showregs_op,
|
||||
/* q */ NULL,
|
||||
#ifdef CONFIG_VT
|
||||
/* r */ &sysrq_unraw_op,
|
||||
#else
|
||||
/* r */ NULL,
|
||||
#endif
|
||||
/* s */ &sysrq_sync_op,
|
||||
/* t */ &sysrq_showstate_op,
|
||||
/* u */ &sysrq_mountro_op,
|
||||
/* v */ NULL, /* May be assigned at init time by SMP VOYAGER */
|
||||
/* w */ NULL,
|
||||
/* x */ NULL,
|
||||
/* y */ NULL,
|
||||
/* z */ NULL
|
||||
|
||||
static struct sysrq_key_op *sysrq_key_table[36] = {
|
||||
&sysrq_loglevel_op, /* 0 */
|
||||
&sysrq_loglevel_op, /* 1 */
|
||||
&sysrq_loglevel_op, /* 2 */
|
||||
&sysrq_loglevel_op, /* 3 */
|
||||
&sysrq_loglevel_op, /* 4 */
|
||||
&sysrq_loglevel_op, /* 5 */
|
||||
&sysrq_loglevel_op, /* 6 */
|
||||
&sysrq_loglevel_op, /* 7 */
|
||||
&sysrq_loglevel_op, /* 8 */
|
||||
&sysrq_loglevel_op, /* 9 */
|
||||
|
||||
/*
|
||||
* Don't use for system provided sysrqs, it is handled specially on
|
||||
* sparc and will never arrive
|
||||
*/
|
||||
NULL, /* a */
|
||||
&sysrq_reboot_op, /* b */
|
||||
&sysrq_crashdump_op, /* c */
|
||||
&sysrq_showlocks_op, /* d */
|
||||
&sysrq_term_op, /* e */
|
||||
&sysrq_moom_op, /* f */
|
||||
NULL, /* g */
|
||||
NULL, /* h */
|
||||
&sysrq_kill_op, /* i */
|
||||
NULL, /* j */
|
||||
&sysrq_SAK_op, /* k */
|
||||
NULL, /* l */
|
||||
&sysrq_showmem_op, /* m */
|
||||
&sysrq_unrt_op, /* n */
|
||||
/* This will often be registered as 'Off' at init time */
|
||||
NULL, /* o */
|
||||
&sysrq_showregs_op, /* p */
|
||||
NULL, /* q */
|
||||
&sysrq_unraw_op, /* r */
|
||||
&sysrq_sync_op, /* s */
|
||||
&sysrq_showstate_op, /* t */
|
||||
&sysrq_mountro_op, /* u */
|
||||
/* May be assigned at init time by SMP VOYAGER */
|
||||
NULL, /* v */
|
||||
NULL, /* w */
|
||||
NULL, /* x */
|
||||
NULL, /* y */
|
||||
NULL /* z */
|
||||
};
|
||||
|
||||
/* key2index calculation, -1 on invalid index */
|
||||
static int sysrq_key_table_key2index(int key) {
|
||||
static int sysrq_key_table_key2index(int key)
|
||||
{
|
||||
int retval;
|
||||
if ((key >= '0') && (key <= '9')) {
|
||||
|
||||
if ((key >= '0') && (key <= '9'))
|
||||
retval = key - '0';
|
||||
} else if ((key >= 'a') && (key <= 'z')) {
|
||||
else if ((key >= 'a') && (key <= 'z'))
|
||||
retval = key + 10 - 'a';
|
||||
} else {
|
||||
else
|
||||
retval = -1;
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
||||
/*
|
||||
* get and put functions for the table, exposed to modules.
|
||||
*/
|
||||
|
||||
struct sysrq_key_op *__sysrq_get_key_op (int key) {
|
||||
struct sysrq_key_op *op_p;
|
||||
struct sysrq_key_op *__sysrq_get_key_op(int key)
|
||||
{
|
||||
struct sysrq_key_op *op_p = NULL;
|
||||
int i;
|
||||
|
||||
|
||||
i = sysrq_key_table_key2index(key);
|
||||
op_p = (i == -1) ? NULL : sysrq_key_table[i];
|
||||
if (i != -1)
|
||||
op_p = sysrq_key_table[i];
|
||||
return op_p;
|
||||
}
|
||||
|
||||
static void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p) {
|
||||
int i;
|
||||
static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
|
||||
{
|
||||
int i = sysrq_key_table_key2index(key);
|
||||
|
||||
i = sysrq_key_table_key2index(key);
|
||||
if (i != -1)
|
||||
sysrq_key_table[i] = op_p;
|
||||
}
|
||||
|
||||
/*
|
||||
* This is the non-locking version of handle_sysrq
|
||||
* It must/can only be called by sysrq key handlers,
|
||||
* as they are inside of the lock
|
||||
* This is the non-locking version of handle_sysrq. It must/can only be called
|
||||
* by sysrq key handlers, as they are inside of the lock
|
||||
*/
|
||||
|
||||
void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty, int check_mask)
|
||||
void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty,
|
||||
int check_mask)
|
||||
{
|
||||
struct sysrq_key_op *op_p;
|
||||
int orig_log_level;
|
||||
int i, j;
|
||||
int i;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&sysrq_key_table_lock, flags);
|
||||
|
|
@ -401,26 +375,34 @@ void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty, in
|
|||
|
||||
op_p = __sysrq_get_key_op(key);
|
||||
if (op_p) {
|
||||
/* Should we check for enabled operations (/proc/sysrq-trigger should not)
|
||||
* and is the invoked operation enabled? */
|
||||
/*
|
||||
* Should we check for enabled operations (/proc/sysrq-trigger
|
||||
* should not) and is the invoked operation enabled?
|
||||
*/
|
||||
if (!check_mask || sysrq_enabled == 1 ||
|
||||
(sysrq_enabled & op_p->enable_mask)) {
|
||||
printk ("%s\n", op_p->action_msg);
|
||||
printk("%s\n", op_p->action_msg);
|
||||
console_loglevel = orig_log_level;
|
||||
op_p->handler(key, pt_regs, tty);
|
||||
}
|
||||
else
|
||||
} else {
|
||||
printk("This sysrq operation is disabled.\n");
|
||||
}
|
||||
} else {
|
||||
printk("HELP : ");
|
||||
/* Only print the help msg once per handler */
|
||||
for (i=0; i<SYSRQ_KEY_TABLE_LENGTH; i++)
|
||||
if (sysrq_key_table[i]) {
|
||||
for (j=0; sysrq_key_table[i] != sysrq_key_table[j]; j++);
|
||||
if (j == i)
|
||||
printk ("%s ", sysrq_key_table[i]->help_msg);
|
||||
for (i = 0; i < ARRAY_SIZE(sysrq_key_table); i++) {
|
||||
if (sysrq_key_table[i]) {
|
||||
int j;
|
||||
|
||||
for (j = 0; sysrq_key_table[i] !=
|
||||
sysrq_key_table[j]; j++)
|
||||
;
|
||||
if (j != i)
|
||||
continue;
|
||||
printk("%s ", sysrq_key_table[i]->help_msg);
|
||||
}
|
||||
}
|
||||
printk ("\n");
|
||||
printk("\n");
|
||||
console_loglevel = orig_log_level;
|
||||
}
|
||||
spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
|
||||
|
|
@ -430,16 +412,17 @@ void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty, in
|
|||
* This function is called by the keyboard handler when SysRq is pressed
|
||||
* and any other keycode arrives.
|
||||
*/
|
||||
|
||||
void handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
|
||||
{
|
||||
if (!sysrq_enabled)
|
||||
return;
|
||||
__handle_sysrq(key, pt_regs, tty, 1);
|
||||
}
|
||||
EXPORT_SYMBOL(handle_sysrq);
|
||||
|
||||
static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
|
||||
struct sysrq_key_op *remove_op_p) {
|
||||
struct sysrq_key_op *remove_op_p)
|
||||
{
|
||||
|
||||
int retval;
|
||||
unsigned long flags;
|
||||
|
|
@ -452,7 +435,6 @@ static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
|
|||
retval = -1;
|
||||
}
|
||||
spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
|
|
@ -460,12 +442,10 @@ int register_sysrq_key(int key, struct sysrq_key_op *op_p)
|
|||
{
|
||||
return __sysrq_swap_key_ops(key, op_p, NULL);
|
||||
}
|
||||
EXPORT_SYMBOL(register_sysrq_key);
|
||||
|
||||
int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
|
||||
{
|
||||
return __sysrq_swap_key_ops(key, NULL, op_p);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(handle_sysrq);
|
||||
EXPORT_SYMBOL(register_sysrq_key);
|
||||
EXPORT_SYMBOL(unregister_sysrq_key);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче