diff options
| author | Lee, Chun-Yi <[email protected]> | 2014-09-12 11:03:58 +0800 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2014-09-16 09:54:31 +0200 |
| commit | 84779575554e2a19b9f6fc8d44f9763546a822ad (patch) | |
| tree | 7f25d3062e3c743d271562f9e2b7691413558565 /net/lapb/lapb_subr.c | |
| parent | 8b375f64dcf45ba5cfb36398b69b877dc35410fa (diff) | |
x86/mm, hibernate: Do not assume the first e820 area to be RAM
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:
e820: BIOS-provided physical RAM map:
BIOS-e820: [mem 0x0000000000000000-0x0000000000096fff] usable
BIOS-e820: [mem 0x0000000000097000-0x0000000000097fff] reserved
...
e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
e820: remove [mem 0x000a0000-0x000fffff] usable
But the region of first 4Kb didn't register to nosave memory:
PM: Registered nosave memory: [mem 0x00097000-0x00097fff]
PM: Registered nosave memory: [mem 0x000a0000-0x000fffff]
The code 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.
Signed-off-by: Lee, Chun-Yi <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Len Brown <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Takashi Iwai <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'net/lapb/lapb_subr.c')
0 files changed, 0 insertions, 0 deletions