Messages in this thread | | | Date | Mon, 27 Feb 2023 15:17:27 +0000 (GMT) | From | "Maciej W. Rozycki" <> | Subject | Re: [PATCH 1/2] MIPS: ebpf jit: Implement DADDI workarounds |
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On Mon, 27 Feb 2023, Johan Almbladh wrote:
> > > DADDI/DADDIU are only available on 64-bit CPUs, so the errata would > > > only be applicable to that. No need for the CONFIG_64BIT conditional. > > > > It’s possible to compile a 32bit kernel for R4000 with CONFIG_CPU_DADDI_WORKAROUNDS > > enabled. > > Yes, but DADDI/DADDIU are 64-bit instructions so they would not be > available when compiling the kernel in 32-bit mode for R4000, and > hence the workaround would not be applicable, right? If this is > correct, I would imagine CONFIG_CPU_DADDI_WORKAROUNDS itself to be > conditional on CONFIG_64BIT. That way the this relationship is > expressed once in the Kconfig file, instead of being spread out over > multiple places in the code.
It is:
select CPU_DADDI_WORKAROUNDS if 64BIT
It only applies to 64-bit operations which are not used in 32-bit code.
Maciej
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