linux-kernel - Re: [PATCH 0/7] EDAC, mce_amd: Issue decoded MCE through the tracepoint

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Date:   Wed, 30 Aug 2017 13:48:43 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tony Luck <tony.luck@...el.com>
Cc:     linux-edac <linux-edac@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Yazen Ghannam <Yazen.Ghannam@....com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...radead.org>
Subject: Re: [PATCH 0/7] EDAC, mce_amd: Issue decoded MCE through the
 tracepoint

Btw,

how about communicating stuff to the userspace daemon like this?

This'll simplify a lot of detection in userspace.

Thoughts?

---
diff --git a/drivers/ras/debugfs.c b/drivers/ras/debugfs.c
index 501603057dff..62d3da9d256f 100644
--- a/drivers/ras/debugfs.c
+++ b/drivers/ras/debugfs.c
@@ -1,5 +1,7 @@
 #include <linux/debugfs.h>
 
+#include "../../arch/x86/kernel/cpu/mcheck/mce-internal.h"
+
 struct dentry *ras_debugfs_dir;
 
 static atomic_t trace_count = ATOMIC_INIT(0);
@@ -12,7 +14,9 @@ EXPORT_SYMBOL_GPL(ras_userspace_consumers);
 
 static int trace_show(struct seq_file *m, void *v)
 {
-	return atomic_read(&trace_count);
+	seq_printf(m, "readers:%d\n", atomic_read(&trace_count));
+	seq_printf(m, "has decoder:%d\n", mca_cfg.has_decoder);
+	return 0;
 }
 
 static int trace_open(struct inode *inode, struct file *file)

-- 
Regards/Gruss,
    Boris.

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