Re: [PATCH 2/2] MIPS: ebpf jit: Implement R4000 workarounds

[Maciej W. Rozycki]

On Mon, 27 Feb 2023, Johan Almbladh wrote:

> > > R4000 is a 64-bit CPU, so the 32-bit JIT implementation will not be
> > > used. From the Makefile:
> > >
> > > ifeq ($(CONFIG_32BIT),y)
> > >        obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o
> > > else
> > >        obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o
> > > endif
> >
> > It’s common practice to run 32-bit kernel on R4000 based systems to save some memory :-)
> 
> Ok, I understand.

 Likewise:

	select CPU_R4000_WORKAROUNDS if 64BIT
	select CPU_R4400_WORKAROUNDS if 64BIT

This only applies to 64-bit operations, which are not used in 32-bit code 
(one reason why these early silicon revisions were originally used with 
32-bit software only).

  Maciej