Merge git://oak/home/sfr/kernels/iseries/work

[firefly-linux-kernel-4.4.55.git] / drivers / char / sysrq.c

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index f59f7cbd525bcd587ec799b3050aa5d8852e75f8..145275ebdd7ee2d6b0a43062838baa6e82ba8ea3 100644 (file)
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -35,6 +35,7 @@
 #include <linux/spinlock.h>
 #include <linux/vt_kern.h>
 #include <linux/workqueue.h>
+#include <linux/kexec.h>
 
 #include <asm/ptrace.h>
 
@@ -94,12 +95,27 @@ static struct sysrq_key_op sysrq_unraw_op = {
 };
 #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)
+{
+       crash_kexec(pt_regs);
+}
+static struct sysrq_key_op sysrq_crashdump_op = {
+       .handler        = sysrq_handle_crashdump,
+       .help_msg       = "Crashdump",
+       .action_msg     = "Trigger a crashdump",
+       .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+#endif
+
 /* reboot sysrq handler */
 static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs,
                                struct tty_struct *tty) 
 {
        local_irq_enable();
-       machine_restart(NULL);
+       emergency_restart();
 }
 
 static struct sysrq_key_op sysrq_reboot_op = {
@@ -212,7 +228,7 @@ static struct sysrq_key_op sysrq_term_op = {
 
 static void moom_callback(void *ignored)
 {
-       out_of_memory(GFP_KERNEL);
+       out_of_memory(GFP_KERNEL, 0);
 }
 
 static DECLARE_WORK(moom_work, moom_callback, NULL);
@@ -273,8 +289,12 @@ static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
                 it is handled specially on the sparc
                 and will never arrive */
 /* b */        &sysrq_reboot_op,
-/* c */ NULL,
-/* d */        NULL,
+#ifdef CONFIG_KEXEC
+/* c */ &sysrq_crashdump_op,
+#else
+/* c */        NULL,
+#endif
+/* d */ NULL,
 /* e */        &sysrq_term_op,
 /* f */        &sysrq_moom_op,
 /* g */        NULL,
@@ -334,7 +354,7 @@ struct sysrq_key_op *__sysrq_get_key_op (int key) {
         return op_p;
 }
 
-void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p) {
+static void __sysrq_put_key_op (int key, struct sysrq_key_op *op_p) {
         int i;
 
        i = sysrq_key_table_key2index(key);
@@ -399,7 +419,7 @@ void handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
        __handle_sysrq(key, pt_regs, tty, 1);
 }
 
-int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
+static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
                                 struct sysrq_key_op *remove_op_p) {
 
        int retval;