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H A Duabi.rstf07b2b3f Mon Dec 05 08:45:26 CST 2022 Conor Dooley <conor.dooley@microchip.com> Documentation: riscv: add a section about ISA string ordering in /proc/cpuinfo

The RISC-V specs are permissive in what they allow as the ISA string,
but how we output this to userspace in /proc/cpuinfo is quasi uABI.

Formalise this as part of the uABI, by documenting the list of rules
we use at this point in time.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221205144525.2148448-4-conor.dooley@microchip.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>