ACPI / extlog: Check for RDMSR failure

ACPI / extlog: Check for RDMSR failure

Origin: https://git.kernel.org/linus/7cecb47f55e00282f972a1e0b09136c8cd938221
Bug-Debian: https://bugs.debian.org/971058

extlog_init() uses rdmsrl() to read an MSR, which on older CPUs
provokes a error message at boot:

    unchecked MSR access error: RDMSR from 0x179 at rIP: 0xcd047307 (native_read_msr+0x7/0x40)

Use rdmsrl_safe() instead, and return -ENODEV if it fails.

Reported-by: jim@photojim.ca
References: https://bugs.debian.org/971058
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Gbp-Pq: Topic bugfix/x86
Gbp-Pq: Name ACPI-extlog-Check-for-RDMSR-failure.patch