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x86, numa, 32-bit: make sure get we kva space 

when 1/3 user/kernel split is used, and less memory is installed, or if
we have a big hole below 4g, max_low_pfn is still using 3g-128m

try to go down from max_low_pfn until we get it. otherwise will panic.

need to make 32-bit code to use register_e820_active_regions ... later.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-06-03 19:32:30 -07:00 committed by Ingo Molnar
parent ab530e1f78
commit 84b56fa46b
1 changed files with 12 additions and 5 deletions
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17
arch/x86/mm/discontig_32.c
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@ -328,6 +328,7 @@ unsigned long __init setup_memory(void)
{
int nid;
unsigned long system_start_pfn, system_max_low_pfn;
long kva_target_pfn;
/*
* When mapping a NUMA machine we allocate the node_mem_map arrays
@ -344,11 +345,17 @@ unsigned long __init setup_memory(void)
system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
system_max_low_pfn = max_low_pfn = find_max_low_pfn();
kva_start_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
kva_start_pfn = find_e820_area(kva_start_pfn<<PAGE_SHIFT,
max_low_pfn<<PAGE_SHIFT,
kva_pages<<PAGE_SHIFT,
PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
do {
kva_start_pfn = find_e820_area(kva_target_pfn<<PAGE_SHIFT,
max_low_pfn<<PAGE_SHIFT,
kva_pages<<PAGE_SHIFT,
PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
kva_target_pfn -= PTRS_PER_PTE;
} while (kva_start_pfn == -1UL && kva_target_pfn > min_low_pfn);
if (kva_start_pfn == -1UL)
panic("Can not get kva space\n");
printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
kva_start_pfn, max_low_pfn);