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

From: Len Brown
Date: Thu Jan 06 2011 - 16:01:32 EST

> ... 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?

Len Brown, Intel Open Source Technology Center

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