[PATCH v4 17/19] ARM: LPAE: mark memory banks with start > ULONG_MAX as highmem

From: Catalin Marinas
Date: Mon Jan 24 2011 - 12:58:13 EST


From: Will Deacon <will.deacon@xxxxxxx>

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 <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
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 a1d8a07..8a55be4 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -782,7 +782,8 @@ static void __init sanity_check_meminfo(void)

#ifdef CONFIG_HIGHMEM
if (__va(bank->start) > vmalloc_min ||
- __va(bank->start) < (void *)PAGE_OFFSET)
+ __va(bank->start) < (void *)PAGE_OFFSET ||
+ bank->start > ULONG_MAX)
highmem = 1;

bank->highmem = highmem;
@@ -791,7 +792,7 @@ static 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, "

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