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arm: ensure enough memory is available for movable zone

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If CONFIG_HIGHMEM is enabled, the memory from the movable
zone will come from highmem as the zone of highest
address present is converted to ZONE_MOVABLE, and only
one zone may be used for ZONE_MOVABLE.

Ensure that ZONE_HIGHMEM is large enough for the
movable zone's required size to be created from
it if CONFIG_FIX_MOVABLE_ZONE is enabled as well.

There needs to be a small ZONE_HIGHMEM even after
memory hotremove (due to a generic 3.0 bug), so
extra is reserved for now.

Change-Id: I285c6ad24a6f2f18fc9e6510d379b126f201b082
Signed-off-by: Larry Bassel <lbassel@codeaurora.org>
This commit is contained in:
Larry Bassel
2011-10-14 10:55:11 -07:00
parent 6eae21afbe
commit f973fab692
1 changed files with 13 additions and 0 deletions
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13
arch/arm/mm/mmu.c
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@@ -791,6 +791,19 @@ void __init sanity_check_meminfo(void)
{
int i, j, highmem = 0;
#if (defined CONFIG_HIGHMEM) && (defined CONFIG_FIX_MOVABLE_ZONE)
/* For now, we must ensure that a small highmem zone exists
* after most of it is transformed into the movable zone.
*/
#define MIN_HIGHMEM_SIZE (5 * SECTION_SIZE)
void *v_movable_start;
v_movable_start = __va(movable_reserved_start) - MIN_HIGHMEM_SIZE;
if (vmalloc_min > v_movable_start)
vmalloc_min = v_movable_start;
#endif
for (i = 0, j = 0; i < meminfo.nr_banks; i++) {
struct membank *bank = &meminfo.bank[j];
*bank = meminfo.bank[i];