linux-kernel - Re: [PATCH v5 03/17] ACPI: bus: Add acpi_riscv

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Message-ID: <ZjNoy6KLtOCTe52q@smile.fi.intel.com>
Date: Thu, 2 May 2024 13:19:55 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Sunil V L <sunilvl@...tanamicro.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-serial@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Anup Patel <anup@...infault.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Robert Moore <robert.moore@...el.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Marc Zyngier <maz@...nel.org>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Andrei Warkentin <andrei.warkentin@...el.com>,
	Haibo1 Xu <haibo1.xu@...el.com>,
	Björn Töpel <bjorn@...nel.org>
Subject: Re: [PATCH v5 03/17] ACPI: bus: Add acpi_riscv_init function

On Thu, May 02, 2024 at 11:12:43AM +0100, Sudeep Holla wrote:
> On Thu, May 02, 2024 at 03:32:25PM +0530, Sunil V L wrote:
> > On Thu, May 02, 2024 at 12:24:14PM +0300, Andy Shevchenko wrote:
> > > On Wed, May 01, 2024 at 05:47:28PM +0530, Sunil V L wrote:
> > > > Add a new function for RISC-V to do any architecture specific
> > > > initialization. This function will be used to create platform devices
> > > > like APLIC, PLIC, RISC-V IOMMU etc. This is similar to acpi_arm_init().
> > >
> > > What is the special about this architecture that it requires a separate
> > > initialization that is _not_ going to be in other cases?
> > > Please, elaborate.
> > >
> > This init function will be used to create GSI mapping structures and in
> > future may be others like iommu. Like I mentioned, ARM already has
> > similar function acpi_arm_init(). So, it is not new right?
> 
> Just to add:
> 
> This is to initialise everything around all the arch specific tables
> which you will not have on any other architectures. We could execute
> on all architectures but the tables will never be found. The main point
> is why do we want to do that if we can optimise and skip on all other
> archs.

You need to carefully write the commit messages. Some kind of the above
paragraphs has to be in there.

-- 
With Best Regards,
Andy Shevchenko