linux-kernel - Re: [PATCH 01/19] ARM64 / ACPI: Get RSDP and ACPI boot-time tables

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Date:	Tue, 29 Jul 2014 21:08:40 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>
CC:	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...aro.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Stone <al.stone@...aro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH 01/19] ARM64 / ACPI: Get RSDP and ACPI boot-time tables

On 2014-7-29 2:29, Sudeep Holla wrote:
[...]
>> +
>> +/*
>> + * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
>> + * variable is still required by the ACPI core
>> + */
>> +u32 acpi_rsdt_forced;
> 
> This looks like yet another stray variable not used anywhere including
> core ACPI

It will be used by ACPICA to get the RSDP in acpi_tb_parse_root_table()
in tbutils.c.

> 
>> +
>> +int acpi_noirq;                        /* skip ACPI IRQ initialization */
>> +int acpi_strict;
>> +int acpi_disabled;
>> +EXPORT_SYMBOL(acpi_disabled);
>> +
>> +int acpi_pci_disabled;         /* skip ACPI PCI scan and IRQ initialization */
>> +EXPORT_SYMBOL(acpi_pci_disabled);
>> +
>> +/*
>> + * __acpi_map_table() will be called before page_init(), so early_ioremap()
>> + * or early_memremap() should be called here to for ACPI table mapping.
>> + */
>> +char *__init __acpi_map_table(unsigned long phys, unsigned long size)
>> +{
>> +       if (!phys || !size)
>> +               return NULL;
>> +
>> +       return early_memremap(phys, size);
>> +}
>> +
>> +void __init __acpi_unmap_table(char *map, unsigned long size)
>> +{
>> +       if (!map || !size)
>> +               return;
>> +
>> +       early_iounmap(map, size);
> 
> Why not early_memunmap for consistency ?

ok.

> Also now there's generic implementation of early mappings does it make
> sense to move this also to acpi core ?

Good point, how about clean it up after this patch set is merged?

Thanks
Hanjun


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