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SubjectRe: [PATCH] Hibernate: Do not assume the first e820 area to be RAM
On Mon 2014-08-11 18:50:52, Lee, Chun-Yi wrote:
> In arch/x86/kernel/setup.c::trim_bios_range(), the codes introduced
> by 1b5576e6 (base on d8a9e6a5), it updates the first 4Kb of memory
> to be E820_RESERVED region. That's because it's a BIOS owned area
> but generally not listed in the E820 table:
>
> [ 0.000000] e820: BIOS-provided physical RAM map:
> [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000096fff] usable
> [ 0.000000] BIOS-e820: [mem 0x0000000000097000-0x0000000000097fff] reserved
> ...
> [ 0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
> [ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
>
> But the region of first 4Kb didn't register to nosave memory:
>
> [ 0.000000] PM: Registered nosave memory: [mem 0x00097000-0x00097fff]
> [ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000fffff]
>
> The codes in e820_mark_nosave_regions() assumes the first e820 area to be
> RAM, so it causes the first 4Kb E820_RESERVED region ignored when register
> to nosave. This patch removed assumption of the first e820 area.
>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Len Brown <len.brown@intel.com>

Acked-by: Pavel Machek <pavel@ucw.cz>

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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