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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
hifive-unleashed-5.1
Juergen Gross 2017-06-20 23:16:37 +02:00 committed by Thomas Gleixner
parent 6057077f6e
commit b867059018
2 changed files with 9 additions and 1 deletions
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8
arch/x86/kernel/cpu/mcheck/dev-mcelog.c
View File

@ -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) {
pr_err("Unable to init device /dev/mcelog (rc: %d)\n", 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;
}

2
drivers/xen/mcelog.c
View File

@ -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: