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ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition allows to use
ldrex and other load-exclusive instructions without a matching strex in
Section A3.4.5 "Load-Exclusive and Store-Exclusive usage restrictions". And in
Section A3.5.3 "Atomicity in the ARM architecture" it states that ldrexd
atomically loads the 64-bit value from suitably aligned memory. This makes
the strexd added in eb50aea437 unnecessary.
ARM Architecture Reference Manual Armv8, for Armv8-A architecture profile
does not state explicitly that ldrexd can be used without a matching strexd,
but does not prohibit this either in Section E2.10.5 "Load-Exclusive and
Store-Exclusive instruction usage restrictions".