From mboxrd@z Thu Jan 1 00:00:00 1970 From: dima@android.com (Dima Zavin) Date: Wed, 9 Feb 2011 14:36:13 -0800 Subject: [PATCH] ARM: mm: don't free memmap entries in the middle of a MAX_ORDER_NR_PAGES block Message-ID: <1297290973-32267-1-git-send-email-dima@android.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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