Merge branch 'linus' into perfcounters/core

[karo-tx-linux.git] / drivers / char / sysrq.c

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 52146c2a8d9727ce262ced510b73fa76ffdab5a8..9bcf0c9848b18a5c64de420fabfd3245d168c35e 100644 (file)
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -276,6 +276,22 @@ 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)
 {
@@ -408,7 +424,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
        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 */