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The Linux kernel configuration item CONFIG_HAVE_64BIT_ALIGNED_ACCESS:

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Some architectures require 64 bit accesses to be 64 bit aligned, which also requires structs containing 64 bit values to be 64 bit aligned too. This includes some 32 bit architectures which can do 64 bit accesses, as well as 64 bit architectures without unaligned access.

This symbol should be selected by an architecture if 64 bit accesses are required to be 64 bit aligned in this way even though it is not a 64 bit architecture.

See Documentation/unaligned-memory-access.txt for more information on the topic of unaligned memory accesses.



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