Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 4 Aug 2023 19:56:26 +0300
From:   Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To:     Conor Dooley <conor@kernel.org>
Cc:     Sunil V L <sunilvl@ventanamicro.com>, linux-doc@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
        linux-pci@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Daniel Scally <djrscally@gmail.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Anup Patel <anup@brainfault.org>,
        Marc Zyngier <maz@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Robert Moore <robert.moore@intel.com>,
        Haibo Xu <haibo1.xu@intel.com>,
        Andrew Jones <ajones@ventanamicro.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        Atish Kumar Patra <atishp@rivosinc.com>
Subject: Re: [RFC PATCH v1 09/21] RISC-V: cacheflush: Initialize CBO
 variables on ACPI systems
Message-ID: <ZM0tuv5mdgHLdrsr@smile.fi.intel.com>
References: <20230803175916.3174453-1-sunilvl@ventanamicro.com>
 <20230803175916.3174453-10-sunilvl@ventanamicro.com>
 <ZMyTDcffqXYT29JX@smile.fi.intel.com>
 <ZMzC4nHOJOfp0vaa@sunil-laptop>
 <ZM0SZwL9SXrEuFMT@smile.fi.intel.com>
 <20230804-dreamy-unharmed-a502d02af35a@spud>
 <ZM0s6GrfXqx4fu+l@smile.fi.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <ZM0s6GrfXqx4fu+l@smile.fi.intel.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
Precedence: bulk

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