Re: [PATCH v2] MIPS/bpf: Enable bpf_probe_read{, str}() on MIPS again

[Tiezhu Yang]

On 03/22/2021 12:46 PM, Maciej W. Rozycki wrote:
On Thu, 18 Mar 2021, Tiezhu Yang wrote:
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 160b3a8..4b94ec7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -6,6 +6,7 @@ config MIPS
        select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT
        select ARCH_HAS_FORTIFY_SOURCE
        select ARCH_HAS_KCOV
+       select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
  Hmm, documentation on ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE seems rather
scarce, but based on my guess shouldn't this be "if !EVA"?

   Maciej

I do not quite know what the effect if MIPS EVA (Enhanced Virtual 
Addressing)
is set, I saw that ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE should be 
restricted
to archs with non-overlapping address ranges.

I wonder whether MIPS EVA will generate overlapping address ranges?
If yes, it is better to make ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE depend
on !EVA on MIPS.

Thanks,
Tiezhu