ARM 6 is essentially a specification for a processor and not a real processor. Using the memory in the way the kernel does is 'unspecified'. It could work on today's processors made by Ti, but it could completely backfire on tomorrow's processors made by Marvel.
It's impossible to know and if it does start corrupting memory in the kernel then it's going to be 100% ok as far as the processor designers are concerned because they are still following the specification.
It's similar to having the kernel rely on unspecified GCC features were once a user chooses a GCC version they are forced to use it for ever and cannot change it no matter how badly it works with Linux.
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