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It is required for the OS to acknowledge that it is using the MCAX register set and its associated fields by setting the 'McaXEnable' bit in each bank's MCi_CONFIG register. If it is not set, then all UC errors will cause a system panic. Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-edac <linux-edac@vger.kernel.org> Link: http://lkml.kernel.org/r/1453750913-4781-9-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>