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Diffstat (limited to 'arch/x86_64/mm/init.c')
-rw-r--r--arch/x86_64/mm/init.c16
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");