Re: mips allmodconfig build error with llvm-18.1.7-x86_64

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On Mon, 17 Jun 2024, Nathan Chancellor wrote:

> Even with that addressed though, I see another issue in an allmodconfig
> when building arch/mips/kernel/cps-vec.S that I don't recall seeing
> before:
> 
>   arch/mips/kernel/cps-vec.S:363:2: error: instruction requires a CPU feature not currently enabled
>    jr.hb $9
>    ^
>   arch/mips/kernel/cps-vec.S:477:4: error: instruction requires a CPU feature not currently enabled
>   1: jr.hb $8
>      ^

 JR.HB is supposed to be permitted for MIPSr1 as a backwards compatible 
ISA extension, even though coming from MIPSr2 and not originally a part of 
the MIPSr1 ISA (although there was an erratum in some MIPS 4Kc cores that 
caused an RI exception with this encoding).

 FWIW,

  Maciej




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