On some machines, nodes do not always start on MAX_ORDER_NR_PAGES
boundaries. The rest of the VM assumes that pages within a
MAX_ORDER_NR_PAGES range always have valid memmap entries. So,
we round down the bank_start in free_unused_memmap to ensure that
there are valid page structs for all pages within a MAX_ORDER_NR_PAGES
block of pages.
Signed-off-by: Dima Zavin <redacted>
---
arch/arm/mm/init.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index cddd684..1290fbe 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -424,7 +424,8 @@ static void __init free_unused_memmap(struct meminfo *mi)
for_each_bank(i, mi) {
struct membank *bank = &mi->bank[i];
- bank_start = bank_pfn_start(bank);
+ bank_start = round_down(bank_pfn_start(bank),
+ MAX_ORDER_NR_PAGES);
/*
* If we had a previous bank, and there is a space--
1.7.3.1