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xen/setup: Fix for incorrect xen_extra_mem_start initialization under 32-bit

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git commit 24bdb0b62c (xen: do not create
the extra e820 region at an addr lower than 4G) does not take into
account that ifdef CONFIG_X86_32 instead of e820_end_of_low_ram_pfn()
find_low_pfn_range() is called (both calls are from arch/x86/kernel/setup.c).
find_low_pfn_range() behaves correctly and does not require change in
xen_extra_mem_start initialization. Additionally, if xen_extra_mem_start
is initialized in the same way as ifdef CONFIG_X86_64 then memory hotplug
support for Xen balloon driver (under development) is broken.

Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Daniel Kiper 2011-05-11 22:34:38 +02:00 committed by Konrad Rzeszutek Wilk
parent 15bfc09451
commit 0f16d0dfcd
1 changed files with 4 additions and 0 deletions
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4
arch/x86/xen/setup.c
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@ -227,7 +227,11 @@ char * __init xen_memory_setup(void)
memcpy(map_raw, map, sizeof(map));
e820.nr_map = 0;
#ifdef CONFIG_X86_32
xen_extra_mem_start = mem_end;
#else
xen_extra_mem_start = max((1ULL << 32), mem_end);
#endif
for (i = 0; i < memmap.nr_entries; i++) {
unsigned long long end;