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The function mce_severity() is not required to update its msg argument. In fact, mce_severity_amd() does not, which makes mce_no_way_out() return uninitialized data, which may be used later for printing. Assuming that implementations of mce_severity() either always or never update the msg argument (which is currently the case), it is sufficient to initialize the temporary variable in mce_no_way_out(). While at it, avoid printing a useless "Unknown". Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200103150722.20313-4-jschoenh@amazon.de