From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Wed, 10 Aug 2011 16:03:37 +0100 Subject: [PATCH v7 14/16] ARM: LPAE: mark memory banks with start > ULONG_MAX as highmem In-Reply-To: <1312988619-16804-1-git-send-email-catalin.marinas@arm.com> References: <1312988619-16804-1-git-send-email-catalin.marinas@arm.com> Message-ID: <1312988619-16804-15-git-send-email-catalin.marinas@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Will Deacon Memory banks living outside of the 32-bit physical address space do not have a 1:1 pa <-> va mapping and therefore the __va macro may wrap. This patch ensures that such banks are marked as highmem so that the Kernel doesn't try to split them up when it sees that the wrapped virtual address overlaps the vmalloc space. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm/mm/mmu.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 1ba2a5a..85aa25e 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -792,7 +792,8 @@ void __init sanity_check_meminfo(void) *bank = meminfo.bank[i]; #ifdef CONFIG_HIGHMEM - if (__va(bank->start) >= vmalloc_min || + if (bank->start > ULONG_MAX || + __va(bank->start) >= vmalloc_min || __va(bank->start) < (void *)PAGE_OFFSET) highmem = 1; @@ -802,7 +803,7 @@ void __init sanity_check_meminfo(void) * Split those memory banks which are partially overlapping * the vmalloc area greatly simplifying things later. */ - if (__va(bank->start) < vmalloc_min && + if (!highmem && __va(bank->start) < vmalloc_min && bank->size > vmalloc_min - __va(bank->start)) { if (meminfo.nr_banks >= NR_BANKS) { printk(KERN_CRIT "NR_BANKS too low, "