[PATCH v3 06/12] mce, x86: Enable persistent events

[Robert Richter <rric@kernel.org>]

From: Borislav Petkov <bp@suse.de>

... for MCEs collection.

Signed-off-by: Borislav Petkov <bp@suse.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@kernel.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 87a65c9..ffa227b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1990,6 +1990,25 @@ 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
  */
-- 
1.8.3.2