From 97f0b13452198290799fd6780f05fbaa74f927d3 Mon Sep 17 00:00:00 2001
From: Xie XiuQi <xiexiuqi@huawei.com>
Date: Wed, 24 Jun 2015 16:57:36 -0700
Subject: tracing: add trace event for memory-failure

RAS user space tools like rasdaemon which base on trace event, could
receive mce error event, but no memory recovery result event.  So, I want
to add this event to make this scenario complete.

This patch add a event at ras group for memory-failure.

The output like below:
#  tracer: nop
#
#  entries-in-buffer/entries-written: 2/2   #P:24
#
#                               _-----=> irqs-off
#                              / _----=> need-resched
#                             | / _---=> hardirq/softirq
#                             || / _--=> preempt-depth
#                             ||| /     delay
#            TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#               | |       |   ||||       |         |
       mce-inject-13150 [001] ....   277.019359: memory_failure_event: pfn 0x19869: recovery action for free buddy page: Delayed

[xiexiuqi@huawei.com: fix build error]
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Chen Gong <gong.chen@linux.intel.com>
Cc: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/Kconfig          | 1 +
 mm/memory-failure.c | 3 +++
 2 files changed, 4 insertions(+)

(limited to 'mm')

diff --git a/mm/Kconfig b/mm/Kconfig
index 390214da4546..c180af880ed5 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -368,6 +368,7 @@ config MEMORY_FAILURE
 	depends on ARCH_SUPPORTS_MEMORY_FAILURE
 	bool "Enable recovery from hardware memory errors"
 	select MEMORY_ISOLATION
+	select RAS
 	help
 	  Enables code to recover from some memory failures on systems
 	  with MCA recovery. This allows a system to continue running
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 15c0d5ab0893..c53543d89282 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -57,6 +57,7 @@
 #include <linux/mm_inline.h>
 #include <linux/kfifo.h>
 #include "internal.h"
+#include "ras/ras_event.h"
 
 int sysctl_memory_failure_early_kill __read_mostly = 0;
 
@@ -855,6 +856,8 @@ static struct page_state {
 static void action_result(unsigned long pfn, enum mf_action_page_type type,
 			  enum mf_result result)
 {
+	trace_memory_failure_event(pfn, type, result);
+
 	pr_err("MCE %#lx: recovery action for %s: %s\n",
 		pfn, action_page_types[type], action_name[result]);
 }
-- 
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