AcoSail/kernel_optimize_test
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Andi Kleen ac71d12c99 [PATCH] x86_64: Avoid EBDA area in early boot allocator 
Based on analysis&patch from Robert Hentosch

Observed on a Dell PE6850 with 16GB

The problem occurs very early on, when the kernel allocates space for the
temporary memory map called bootmap. The bootmap overlaps the EBDA region.
EBDA region is not historically reserved in the e820 mapping. When the
bootmap is freed it marks the EBDA region as usable.

If you notice in setup.c there is already code to work around the EBDA
in reserve_ebda_region(), this check however occurs after the bootmap
is allocated and doesn't prevent the bootmap from using this range.

AK: I redid the original patch. Thanks also to Jan Beulich for
spotting some mistakes.

Cc: Robert_Hentosch@dell.com
Cc: jbeulich@novell.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-05-08 09:34:56 -07:00
..
alpha [PATCH] Alpha: strncpy() fix 2006-04-25 07:51:06 -07:00
arm [ARM] 3507/1: Replace map_desc.physical with map_desc.pfn: aaed2000 2006-05-07 22:49:24 +01:00
arm26 [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
cris [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
frv [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
h8300 [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
i386 [PATCH] x86_64: avoid IRQ0 ioapic pin collision 2006-05-08 09:34:56 -07:00
ia64 [IA64] strcpy returns NULL pointer and not destination pointer 2006-05-05 11:34:55 -07:00
m32r [PATCH] m32r: update switch_to macro for tuning 2006-04-19 09:13:51 -07:00
m68k [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
m68knommu [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
mips [PATCH] drop task argument of audit_syscall_{entry,exit} 2006-05-01 06:06:18 -04:00
parisc [PARISC] Add new entries to the syscall table 2006-04-21 22:20:35 +00:00
powerpc [PATCH] powerpc: Use the ibm,pa-features property if available 2006-05-03 23:06:47 +10:00
ppc [PATCH] ppc32 CPM_UART: fixes and improvements 2006-05-03 23:06:44 +10:00
s390 Merge branch 'audit.b10' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current 2006-05-01 21:43:05 -07:00
sh [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
sh64 [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
sparc [SPARC]: Hook up vmsplice into syscall tables. 2006-05-03 13:55:46 -07:00
sparc64 [SPARC]: Hook up vmsplice into syscall tables. 2006-05-03 13:55:46 -07:00
um [PATCH] uml: change timer initialization 2006-05-03 20:05:40 -07:00
v850 [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00
x86_64 [PATCH] x86_64: Avoid EBDA area in early boot allocator 2006-05-08 09:34:56 -07:00
xtensa [PATCH] No arch-specific strpbrk implementations 2006-04-11 06:18:40 -07:00