X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;ds=sidebyside;f=drivers%2Fchar%2Fsysrq.c;h=94966edfb44dedc340d4d81f230c43a0aec9b7bf;hb=aaad430378dd128ee015c8ed6e77809317c496a5;hp=1d8c4ae615513e9d6dd54875ba2dbae57a87e0fb;hpb=88ad0bf6890505cbd9ca1dbb79944a27b5c8697d;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 1d8c4ae6..94966ed 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -23,8 +23,8 @@
 #include <linux/reboot.h>
 #include <linux/sysrq.h>
 #include <linux/kbd_kern.h>
+#include <linux/proc_fs.h>
 #include <linux/quotaops.h>
-#include <linux/smp_lock.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/suspend.h>
@@ -37,6 +37,7 @@
 #include <linux/kexec.h>
 #include <linux/irq.h>
 #include <linux/hrtimer.h>
+#include <linux/oom.h>
 
 #include <asm/ptrace.h>
 #include <asm/irq_regs.h>
@@ -108,12 +109,12 @@ static void sysrq_handle_unraw(int key, struct tty_struct *tty)
 	struct kbd_struct *kbd = &kbd_table[fg_console];
 
 	if (kbd)
-		kbd->kbdmode = VC_XLATE;
+		kbd->kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
 }
 static struct sysrq_key_op sysrq_unraw_op = {
 	.handler	= sysrq_handle_unraw,
 	.help_msg	= "unRaw",
-	.action_msg	= "Keyboard mode set to XLATE",
+	.action_msg	= "Keyboard mode set to system default",
 	.enable_mask	= SYSRQ_ENABLE_KEYBOARD,
 };
 #else
@@ -167,7 +168,7 @@ static void sysrq_handle_show_timers(int key, struct tty_struct *tty)
 static struct sysrq_key_op sysrq_show_timers_op = {
 	.handler	= sysrq_handle_show_timers,
 	.help_msg	= "show-all-timers(Q)",
-	.action_msg	= "Show Pending Timers",
+	.action_msg	= "Show clockevent devices & pending hrtimers (no others)",
 };
 
 static void sysrq_handle_mountro(int key, struct tty_struct *tty)
@@ -196,6 +197,48 @@ static struct sysrq_key_op sysrq_showlocks_op = {
 #define sysrq_showlocks_op (*(struct sysrq_key_op *)0)
 #endif
 
+#ifdef CONFIG_SMP
+static DEFINE_SPINLOCK(show_lock);
+
+static void showacpu(void *dummy)
+{
+	unsigned long flags;
+
+	/* Idle CPUs have no interesting backtrace. */
+	if (idle_cpu(smp_processor_id()))
+		return;
+
+	spin_lock_irqsave(&show_lock, flags);
+	printk(KERN_INFO "CPU%d:\n", smp_processor_id());
+	show_stack(NULL, NULL);
+	spin_unlock_irqrestore(&show_lock, flags);
+}
+
+static void sysrq_showregs_othercpus(struct work_struct *dummy)
+{
+	smp_call_function(showacpu, NULL, 0);
+}
+
+static DECLARE_WORK(sysrq_showallcpus, sysrq_showregs_othercpus);
+
+static void sysrq_handle_showallcpus(int key, struct tty_struct *tty)
+{
+	struct pt_regs *regs = get_irq_regs();
+	if (regs) {
+		printk(KERN_INFO "CPU%d:\n", smp_processor_id());
+		show_regs(regs);
+	}
+	schedule_work(&sysrq_showallcpus);
+}
+
+static struct sysrq_key_op sysrq_showallcpus_op = {
+	.handler	= sysrq_handle_showallcpus,
+	.help_msg	= "aLlcpus",
+	.action_msg	= "Show backtrace of all active CPUs",
+	.enable_mask	= SYSRQ_ENABLE_DUMP,
+};
+#endif
+
 static void sysrq_handle_showregs(int key, struct tty_struct *tty)
 {
 	struct pt_regs *regs = get_irq_regs();
@@ -231,6 +274,22 @@ static struct sysrq_key_op sysrq_showstate_blocked_op = {
 	.enable_mask	= SYSRQ_ENABLE_DUMP,
 };
 
+#ifdef CONFIG_TRACING
+#include <linux/ftrace.h>
+
+static void sysrq_ftrace_dump(int key, struct tty_struct *tty)
+{
+	ftrace_dump();
+}
+static struct sysrq_key_op sysrq_ftrace_dump_op = {
+	.handler	= sysrq_ftrace_dump,
+	.help_msg	= "dumpZ-ftrace-buffer",
+	.action_msg	= "Dump ftrace buffer",
+	.enable_mask	= SYSRQ_ENABLE_DUMP,
+};
+#else
+#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)0)
+#endif
 
 static void sysrq_handle_showmem(int key, struct tty_struct *tty)
 {
@@ -251,7 +310,7 @@ static void send_sig_all(int sig)
 	struct task_struct *p;
 
 	for_each_process(p) {
-		if (p->mm && !is_init(p))
+		if (p->mm && !is_global_init(p))
 			/* Not swapper, init nor kernel thread */
 			force_sig(sig, p);
 	}
@@ -271,8 +330,7 @@ static struct sysrq_key_op sysrq_term_op = {
 
 static void moom_callback(struct work_struct *ignored)
 {
-	out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL],
-			GFP_KERNEL, 0);
+	out_of_memory(node_zonelist(0, GFP_KERNEL), GFP_KERNEL, 0);
 }
 
 static DECLARE_WORK(moom_work, moom_callback);
@@ -285,6 +343,7 @@ static struct sysrq_key_op sysrq_moom_op = {
 	.handler	= sysrq_handle_moom,
 	.help_msg	= "Full",
 	.action_msg	= "Manual OOM execution",
+	.enable_mask	= SYSRQ_ENABLE_SIGNAL,
 };
 
 static void sysrq_handle_kill(int key, struct tty_struct *tty)
@@ -341,7 +400,11 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
 	&sysrq_kill_op,			/* i */
 	NULL,				/* j */
 	&sysrq_SAK_op,			/* k */
+#ifdef CONFIG_SMP
+	&sysrq_showallcpus_op,		/* l */
+#else
 	NULL,				/* l */
+#endif
 	&sysrq_showmem_op,		/* m */
 	&sysrq_unrt_op,			/* n */
 	/* o: This will often be registered as 'Off' at init time */
@@ -357,8 +420,9 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
 	&sysrq_showstate_blocked_op,	/* w */
 	/* x: May be registered on ppc/powerpc for xmon */
 	NULL,				/* x */
+	/* y: May be registered on sparc64 for global register dump */
 	NULL,				/* y */
-	NULL				/* z */
+	&sysrq_ftrace_dump_op,		/* z */
 };
 
 /* key2index calculation, -1 on invalid index */
@@ -487,3 +551,32 @@ int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
 	return __sysrq_swap_key_ops(key, NULL, op_p);
 }
 EXPORT_SYMBOL(unregister_sysrq_key);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * writing 'C' to /proc/sysrq-trigger is like sysrq-C
+ */
+static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
+				   size_t count, loff_t *ppos)
+{
+	if (count) {
+		char c;
+
+		if (get_user(c, buf))
+			return -EFAULT;
+		__handle_sysrq(c, NULL, 0);
+	}
+	return count;
+}
+
+static const struct file_operations proc_sysrq_trigger_operations = {
+	.write		= write_sysrq_trigger,
+};
+
+static int __init sysrq_init(void)
+{
+	proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
+	return 0;
+}
+module_init(sysrq_init);
+#endif