Fix documentation of sysrq-q

[linux-2.6-omap-h63xx.git] / drivers / char / sysrq.c

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 8fdfe9c871e3af99f5a632d2f893bbd0508455ab..d0c0d64ed366ce9e961c7dbbfca03a9764e29321 100644 (file)
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -23,6 +23,7 @@
 #include <linux/reboot.h>
 #include <linux/sysrq.h>
 #include <linux/kbd_kern.h>
+#include <linux/proc_fs.h>
 #include <linux/quotaops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -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 pending hrtimers (no others)",
 };
 
 static void sysrq_handle_mountro(int key, struct tty_struct *tty)
@@ -326,6 +327,7 @@ 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)
@@ -533,3 +535,32 @@ 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