Commit 84b56fa4 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

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: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ab530e1f

arch/x86/mm/discontig_32.c

+12 −5
Original line number Diff line number Diff line
@@ -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,

	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);

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