linux-kernel - [PATCH v2 04/14] MCE: Enable persistent event

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Date:	Tue, 11 Jun 2013 18:42:30 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...e.de>,
	Robert Richter <robert.richter@...aro.org>,
	Robert Richter <rric@...nel.org>
Subject: [PATCH v2 04/14] MCE: Enable persistent event

From: Borislav Petkov <bp@...e.de>

... for MCEs collection.

Changes made by Robert Richter <robert.richter@...aro.org>:

The mce_record tracepoint needs tracepoints to be enabled. Fixing
build error for no-tracepoints configs.

Signed-off-by: Borislav Petkov <bp@...e.de>
[ Fix build error for no-tracepoints configs ]
Signed-off-by: Robert Richter <robert.richter@...aro.org>
Signed-off-by: Robert Richter <rric@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 9239504..d421937 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1987,6 +1987,24 @@ int __init mcheck_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_TRACEPOINTS
+
+int __init mcheck_init_tp(void)
+{
+	if (perf_add_persistent_event_by_id(event_mce_record.event.type)) {
+		pr_err("Error adding MCE persistent event.\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+/*
+ * We can't run earlier because persistent events uses anon_inode_getfile and
+ * its anon_inode_mnt gets initialized as a fs_initcall.
+ */
+fs_initcall_sync(mcheck_init_tp);
+
+#endif /* CONFIG_TRACEPOINTS */
+
 /*
  * mce_syscore: PM support
  */
-- 
1.8.1.1

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