diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/discontig_32.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c index 88a7499e8e4..9f1d02cfde3 100644 --- a/arch/x86/mm/discontig_32.c +++ b/arch/x86/mm/discontig_32.c @@ -268,6 +268,7 @@ unsigned long __init setup_memory(void) { int nid; unsigned long system_start_pfn, system_max_low_pfn; + unsigned long wasted_pages; /* * When mapping a NUMA machine we allocate the node_mem_map arrays @@ -292,7 +293,14 @@ unsigned long __init setup_memory(void) kva_start_pfn = PFN_DOWN(initrd_start - PAGE_OFFSET) - kva_pages; #endif - kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1); + + /* + * We waste pages past at the end of the KVA for no good reason other + * than how it is located. This is bad. + */ + wasted_pages = kva_start_pfn & (PTRS_PER_PTE-1); + kva_start_pfn -= wasted_pages; + kva_pages += wasted_pages; system_max_low_pfn = max_low_pfn = find_max_low_pfn(); printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n", @@ -345,7 +353,8 @@ unsigned long __init setup_memory(void) void __init numa_kva_reserve(void) { - reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages)); + if (kva_pages) + reserve_bootmem(PFN_PHYS(kva_start_pfn), PFN_PHYS(kva_pages)); } void __init zone_sizes_init(void) |