linux-kernel - Re: [PATCH 1/1] PM: fix oops in suspend/hibernate code

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Date:	Thu, 06 Jan 2011 16:01:12 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jiri Slaby <jirislaby@...il.com>, Jiri Slaby <jslaby@...e.cz>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH 1/1] PM: fix oops in suspend/hibernate code

> ... My theory is that we have mapped the
> same area already using ioremap_cache() and now we're trying to map it again
> using ioremap_nocache(), hence the conflict.  I need to confirm this.

On my test box.

BIOS-e820: 0000000077626000 - 0000000077632000 (ACPI NVS)

yet there are at least two tables (FACS and SSDT)
that live in that region, and there are several
run-time AML memory opregions residing in that range too.
So the region has already been mapped by acpi_os_map_memory()
(now using ioremap_cache()) before suspend_nvs_save() runs.

Is there a reason that suspend_nvs_save()
requires a non-cached mapping?

cheers,
Len Brown, Intel Open Source Technology Center

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