This option uses LDREXB/STREXB to emulate SWPB but these instructions
are not supported on all the ARMv6 processors.
Reported-by: NAnand Gadiyar <gadiyar@ti.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Leif Lindholm <Leif.Lindholm@arm.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>