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

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Message-ID: <ZM0s6GrfXqx4fu+l@smile.fi.intel.com>
Date:   Fri, 4 Aug 2023 19:52:56 +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 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.

-- 
With Best Regards,
Andy Shevchenko