linux-kernel - Re: [GIT PULL] Fix RISC-V's arch-topology reporting

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Date:   Thu, 18 Aug 2022 14:03:25 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Conor.Dooley@...rochip.com
CC:     sudeep.holla@....com, catalin.marinas@....com,
        Will Deacon <will@...nel.org>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        atishp@...shpatra.org, Brice.Goglin@...ia.fr,
        Greg KH <gregkh@...uxfoundation.org>
Subject:     Re: [GIT PULL] Fix RISC-V's arch-topology reporting

On Mon, 15 Aug 2022 15:14:55 PDT (-0700), Conor.Dooley@...rochip.com wrote:
> Hey Will/Palmer/Sudeep,
> 
> Catalin suggested [0] dropping the CC: stable for the arm64 patch and
> instead making it a specific prereq of the RISC-V patch & making a PR,
> so here we are.. I was still up when -rc1 came out so pushed it last
> night to get the test coverage, but LKP seems to not have reported a
> build success since early on the 13th so not holding my horses! I built
> it again for both ARMs and RISC-V myself.
> 
> I tagged it tonight, so it's on conor/linux.git as riscv-topo-on-6.0-rc1
> with the prereq specified.
> 
> Not sure if you want to merge this too Sudeep or if that's up to Greg?

It's a little bit vague what you're asking for here, so I'm just going 
to kind of guessing here but this on riscv/for-next.  I'm not sure if 
you were looking for me to just merge the arch/riscv bits or if this 
should be on fixes (just looking at the patch makes it look like it 
should be), but I don't want to send up some arm64 code to fixes without 
it being pretty explicit that I should do so

Acked-by: Palmer Dabbelt <palmer@...osinc.com> # arch/riscv bits, for 6.0-rc

in case someone else wants to send it up before I get back to this, I'm 
fine either way.

Thanks!

> 
> Thanks,
> Conor.
> 
> 0 - https://lore.kernel.org/linux-riscv/Ytac7G1zlq6WW4jt@arm.com/
> 
> The following changes since commit 568035b01cfb107af8d2e4bd2fb9aea22cf5b868:
> 
>   Linux 6.0-rc1 (2022-08-14 15:50:18 -0700)
> 
> are available in the Git repository at:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/ tags/riscv-topo-on-6.0-rc1
> 
> for you to fetch changes up to fbd92809997a391f28075f1c8b5ee314c225557c:
> 
>   riscv: topology: fix default topology reporting (2022-08-15 22:07:34 +0100)
> 
> ----------------------------------------------------------------
> Fix RISC-V's topology reporting
> 
> The goal here is the fix the incorrectly reported arch topology on
> RISC-V which seems to have been broken since it was added.
> cpu, package and thread IDs are all currently reported as -1, so tools
> like lstopo think systems have multiple threads on the same core when
> this is not true:
> https://github.com/open-mpi/hwloc/issues/536
> 
> arm64's topology code basically applies to RISC-V too, so it has been
> made generic along with the removal of MPIDR related code, which
> appears to be redudant code since '3102bc0e6ac7 ("arm64: topology: Stop
> using MPIDR for topology information")' replaced the code that actually
> interacted with MPIDR with default values.
> 
> ----------------------------------------------------------------
> Conor Dooley (2):
>       arm64: topology: move store_cpu_topology() to shared code
>       riscv: topology: fix default topology reporting
> 
>  arch/arm64/kernel/topology.c | 40 ----------------------------------------
>  arch/riscv/Kconfig           |  2 +-
>  arch/riscv/kernel/smpboot.c  |  3 ++-
>  drivers/base/arch_topology.c | 19 +++++++++++++++++++
>  4 files changed, 22 insertions(+), 42 deletions(-)