linux-kernel - Re: [PATCH v8 0/7] Unify CPU topology across ARM & RISC-V

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Date:   Fri, 12 Jul 2019 10:16:40 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Atish Patra <atish.patra@....com>
cc:     linux-kernel@...r.kernel.org,
        Jeremy Linton <jeremy.linton@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Otto Sabart <ottosabart@...erm.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v8 0/7] Unify CPU topology across ARM & RISC-V 

Folks,

On Thu, 27 Jun 2019, Atish Patra wrote:

> The cpu-map DT entry in ARM can describe the CPU topology in much better
> way compared to other existing approaches. RISC-V can easily adopt this
> binding to represent its own CPU topology. Thus, both cpu-map DT
> binding and topology parsing code can be moved to a common location so
> that RISC-V or any other architecture can leverage that.
> 
> The relevant discussion regarding unifying cpu topology can be found in
> [1].
> 
> arch_topology seems to be a perfect place to move the common code. I
> have not introduced any significant functional changes in the moved code.
> The only downside in this approach is that the capacity code will be
> executed for RISC-V as well. But, it will exit immediately after not
> able to find the appropriate DT node. If the overhead is considered too
> much, we can always compile out capacity related functions under a
> different config for the architectures that do not support them.
> 
> There was an opportunity to unify topology data structure for ARM32 done
> by patch 3/4. But, I refrained from making any other changes as I am not
> very well versed with original intention for some functions that
> are present in arch_topology.c. I hope this patch series can be served
> as a baseline for such changes in the future.
> 
> The patches have been tested for RISC-V, ARM64, ARM32 & compile tested for
> x86.

Since these patches touch files across several different architectures, 
and thus really should sit in -next for a while; and because it's late in 
the merge window, I'm planning to postpone sending these patches upstream 
until after v5.3-rc1 is released.

Once v5.3-rc1 is released, let's plan to get these patches rebased and 
reposted and into linux-next as soon as possible.


Sorry for the delay here,


- Paul