linux-kernel - [PATCH 06/16] mce, x86: Enable persistent events

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Date:	Mon,  7 Apr 2014 17:04:28 +0200
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <rric@...nel.org>
Cc:	Borislav Petkov <bp@...e.de>
Subject: [PATCH 06/16] mce, x86: Enable persistent events

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

... for MCEs collection.

Signed-off-by: Borislav Petkov <bp@...e.de>
[ rric: Fix build error for no-tracepoints configs ]
[ rric: Return proper error code. ]
[ rric: No error message if perf is disabled. ]
Signed-off-by: Robert Richter <rric@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 4d5419b..92b0d45 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2018,6 +2018,25 @@ int __init mcheck_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_EVENT_TRACING
+
+int __init mcheck_init_tp(void)
+{
+	int ret = perf_add_persistent_tp(&event_mce_record);
+
+	if (ret && ret != -ENOENT)
+		pr_err("Error adding MCE persistent event: %d\n", ret);
+
+	return ret;
+}
+/*
+ * 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_EVENT_TRACING */
+
 /*
  * mce_syscore: PM support
  */
-- 
1.7.11.7

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