linux-kernel - Re: [PATCH v2 10/18] x86, acpi: Try to find if SRAT is overrided earlier.

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Message-ID: <1375459527.10300.77.camel@misato.fc.hp.com>
Date:	Fri, 02 Aug 2013 10:05:27 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	hpa@...or.com, akpm@...ux-foundation.org, tj@...nel.org,
	trenn@...e.de, yinghai@...nel.org, jiang.liu@...wei.com,
	wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 10/18] x86, acpi: Try to find if SRAT is overrided
 earlier.

On Fri, 2013-08-02 at 13:49 +0800, Tang Chen wrote:
> On 08/02/2013 09:19 AM, Toshi Kani wrote:
> ......
> >> +phys_addr_t __init early_acpi_override_srat(void)
> >> +{
> >> +	int i;
> >> +	u32 length;
> >> +	long offset;
> >> +	void *ramdisk_vaddr;
> >> +	struct acpi_table_header *table;
> >> +	struct cpio_data file;
> >> +	unsigned long map_step = NR_FIX_BTMAPS<<  PAGE_SHIFT;
> >> +	phys_addr_t ramdisk_image = get_ramdisk_image();
> >> +	char cpio_path[32] = "kernel/firmware/acpi/";
> >
> > Don't you need to check if ramdisk is present before parsing the table?
> > You may need something like:
> >
> >    if (!ramdisk_image || !get_ramdisk_size())
> >          return 0;
> 
> Yes, it is better to do such a check here. But is there a possibility that
> no ramdisk is present and we come to setup_arch() ?

Without a ramdisk, the boot procedure will likely fail in mounting the
root disk due to missing drivers.  But it should come to setup_arch()
without it.

Thanks,
-Toshi


> 
> ......
> >> +
> >> +	return ramdisk_image;
> >
> > Doesn't this function return a physical address regardless of SRAT if a
> > ramdisk is present?
> 
> Yes, and it is not good. I'll add the check above so that this won't happen.
> 
> Thanks.
> 


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