1 files changed, 27 insertions, 11 deletions

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index ce0d9da52a8a..d41b9f6f7903 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -82,7 +82,7 @@ static void sysrq_handle_loglevel(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_loglevel_op = {
         .handler        = sysrq_handle_loglevel,
-        .help_msg       = "loglevel0-8",
+        .help_msg       = "loglevel(0-9)",
         .action_msg     = "Changing Loglevel",
         .enable_mask    = SYSRQ_ENABLE_LOG,
 };
@@ -233,7 +233,7 @@ static void sysrq_handle_showallcpus(int key, struct tty_struct *tty)
 
 static struct sysrq_key_op sysrq_showallcpus_op = {
         .handler        = sysrq_handle_showallcpus,
-        .help_msg       = "aLlcpus",
+        .help_msg       = "show-backtrace-all-active-cpus(L)",
         .action_msg     = "Show backtrace of all active CPUs",
         .enable_mask    = SYSRQ_ENABLE_DUMP,
 };
@@ -247,7 +247,7 @@ static void sysrq_handle_showregs(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_showregs_op = {
         .handler        = sysrq_handle_showregs,
-        .help_msg       = "showPc",
+        .help_msg       = "show-registers(P)",
         .action_msg     = "Show Regs",
         .enable_mask    = SYSRQ_ENABLE_DUMP,
 };
@@ -258,7 +258,7 @@ static void sysrq_handle_showstate(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_showstate_op = {
         .handler        = sysrq_handle_showstate,
-        .help_msg       = "showTasks",
+        .help_msg       = "show-task-states(T)",
         .action_msg     = "Show State",
         .enable_mask    = SYSRQ_ENABLE_DUMP,
 };
@@ -269,11 +269,27 @@ static void sysrq_handle_showstate_blocked(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_showstate_blocked_op = {
         .handler        = sysrq_handle_showstate_blocked,
-        .help_msg       = "shoW-blocked-tasks",
+        .help_msg       = "show-blocked-tasks(W)",
         .action_msg     = "Show Blocked State",
         .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)
 {
@@ -281,7 +297,7 @@ static void sysrq_handle_showmem(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_showmem_op = {
         .handler        = sysrq_handle_showmem,
-        .help_msg       = "showMem",
+        .help_msg       = "show-memory-usage(M)",
         .action_msg     = "Show Memory",
         .enable_mask    = SYSRQ_ENABLE_DUMP,
 };
@@ -307,7 +323,7 @@ static void sysrq_handle_term(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_term_op = {
         .handler        = sysrq_handle_term,
-        .help_msg       = "tErm",
+        .help_msg       = "terminate-all-tasks(E)",
         .action_msg     = "Terminate All Tasks",
         .enable_mask    = SYSRQ_ENABLE_SIGNAL,
 };
@@ -325,7 +341,7 @@ static void sysrq_handle_moom(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_moom_op = {
         .handler        = sysrq_handle_moom,
-        .help_msg       = "Full",
+        .help_msg       = "memory-full-oom-kill(F)",
         .action_msg     = "Manual OOM execution",
         .enable_mask    = SYSRQ_ENABLE_SIGNAL,
 };
@@ -337,7 +353,7 @@ static void sysrq_handle_kill(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_kill_op = {
         .handler        = sysrq_handle_kill,
-        .help_msg       = "kIll",
+        .help_msg       = "kill-all-tasks(I)",
         .action_msg     = "Kill All Tasks",
         .enable_mask    = SYSRQ_ENABLE_SIGNAL,
 };
@@ -348,7 +364,7 @@ static void sysrq_handle_unrt(int key, struct tty_struct *tty)
 }
 static struct sysrq_key_op sysrq_unrt_op = {
         .handler        = sysrq_handle_unrt,
-        .help_msg       = "Nice",
+        .help_msg       = "nice-all-RT-tasks(N)",
         .action_msg     = "Nice All RT Tasks",
         .enable_mask    = SYSRQ_ENABLE_RTNICE,
 };
@@ -406,7 +422,7 @@ 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 */