diff options
| -rw-r--r-- | arch/x86_64/mm/init.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index e93867850a4..eca60125efc 100644 --- a/arch/x86_64/mm/init.c +++ b/arch/x86_64/mm/init.c @@ -255,14 +255,26 @@ static void __init phys_pud_init(pud_t *pud, unsigned long address, unsigned lon static void __init find_early_table_space(unsigned long end) { - unsigned long puds, pmds, tables; + unsigned long puds, pmds, tables, start; puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + round_up(pmds * sizeof(pmd_t), PAGE_SIZE); - table_start = find_e820_area(0x8000, __pa_symbol(&_text), tables); + /* Put page tables beyond the DMA zones if possible. + RED-PEN might be better to spread them out more over + memory to avoid hotspots */ + if (end > MAX_DMA32_PFN<<PAGE_SHIFT) + start = MAX_DMA32_PFN << PAGE_SHIFT; + else if (end > MAX_DMA_PFN << PAGE_SHIFT) + start = MAX_DMA_PFN << PAGE_SHIFT; + else + start = 0x8000; + + table_start = find_e820_area(start, end, tables); + if (table_start == -1) + table_start = find_e820_area(0x8000, end, tables); if (table_start == -1UL) panic("Cannot find space for the kernel page tables"); |