linux/Documentation/features/arch-support.txt
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   2For generic kernel features that need architecture support, the
   3arch-support.txt file in each feature directory shows the arch
   4support matrix, for all upstream Linux architectures.
   5
   6The meaning of entries in the tables is:
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   8    | ok |  # feature supported by the architecture
   9    |TODO|  # feature not yet supported by the architecture
  10    | .. |  # feature cannot be supported by the hardware
  11    | N/A|  # feature doesn't apply to the architecture
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