linux-kernel - Re: [RFC PATCH v1 09/21] RISC-V: cacheflush: Initialize CBO variables on ACPI systems

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Message-ID: <ZM0tuv5mdgHLdrsr@smile.fi.intel.com>
Date:   Fri, 4 Aug 2023 19:56:26 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     Sunil V L <sunilvl@...tanamicro.com>, linux-doc@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Anup Patel <anup@...infault.org>,
        Marc Zyngier <maz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Robert Moore <robert.moore@...el.com>,
        Haibo Xu <haibo1.xu@...el.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Atish Kumar Patra <atishp@...osinc.com>
Subject: Re: [RFC PATCH v1 09/21] RISC-V: cacheflush: Initialize CBO
 variables on ACPI systems

On Fri, Aug 04, 2023 at 07:52:56PM +0300, Andy Shevchenko wrote:
> On Fri, Aug 04, 2023 at 04:19:27PM +0100, Conor Dooley wrote:
> > On Fri, Aug 04, 2023 at 05:59:51PM +0300, Andy Shevchenko wrote:
> > > On Fri, Aug 04, 2023 at 02:50:34PM +0530, Sunil V L wrote:
> > > > On Fri, Aug 04, 2023 at 08:56:29AM +0300, Andy Shevchenko wrote:
> > > > > On Thu, Aug 03, 2023 at 11:29:04PM +0530, Sunil V L wrote:

...

> > > > > > +#include <asm/acpi.h>
> > > > > 
> > > > > What do you need this for?
> > > > > 
> > > > > >  #include <asm/cacheflush.h>
> > > > > 
> > > > When CONFIG_ACPI is disabled, this include is required to get
> > > > acpi_get_cbo_block_size().
> > > 
> > > How is it useful without ACPI being enabled?
> > 
> > It is not, as evidenced by the `return -EINVAL;`.
> > 
> > > If it's indeed
> > > (in which I do not believe), better to make sure you have it
> > > avaiable independently on CONFIG_ACPI. Otherwise, just put
> > > #ifdef CONFIG_ACPI around the call.
> > 
> > Let's not litter the code with ifdeffery please where it can be easily
> > avoided.
> 
> Including asm/acpi.h looks to me as a "let's avoid it with a hack that it
> is uglier than ifdeffery". Sorry, but ifdeffery for ACPI, with all my full
> agreement with the statement that it's not good, is the correct way to fix
> this.

On the other hand this is an arch code and I see precedents of using the
headers together, alas, it seems not better to me that ugly ifdeffery.

So, I leave it to the respective maintainers to decide.

-- 
With Best Regards,
Andy Shevchenko