Commit b8670590 authored Jun 20, 2017 by Juergen Gross Committed by Thomas Gleixner Jun 20, 2017

x86/MCE, xen/mcelog: Make /dev/mcelog registration messages more precise



When running under Xen as dom0, /dev/mcelog is being provided by Xen
instead of the normal mcelog character device of the MCE core. Convert
an error message being issued by the MCE core in this case to an
informative message that Xen has registered the device.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170614084059.19294-1-jgross@suse.com

parent 6057077f

arch/x86/kernel/cpu/mcheck/dev-mcelog.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -415,9 +415,15 @@ static __init int dev_mcelog_init_device(void)
		/* register character device /dev/mcelog */
		err = misc_register(&mce_chrdev_device);
		if (err) {
		if (err == -EBUSY)
		/* Xen dom0 might have registered the device already. */
		pr_info("Unable to init device /dev/mcelog, already registered");
		else
		pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err);

		return err;
		}

		mce_register_decode_chain(&dev_mcelog_nb);
		return 0;
		}

drivers/xen/mcelog.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -408,6 +408,8 @@ static int __init xen_late_init_mcelog(void)
		if (ret)
		goto deregister;

		pr_info("/dev/mcelog registered by Xen\n");

		return 0;

		deregister:

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