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arm64: mm: make CONFIG_ZONE_DMA32 configurable

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This change makes CONFIG_ZONE_DMA32 defuly y and allows users
to overwrite it only when CONFIG_EXPERT=y.

For the SoCs that do not need CONFIG_ZONE_DMA32, this is the
first step to manage all available memory by a single
zone(normal zone) to reduce the overhead of multiple zones.

The change also fixes a build error when CONFIG_NUMA=y and
CONFIG_ZONE_DMA32=n.

arch/arm64/mm/init.c:195:17: error: use of undeclared identifier 'ZONE_DMA32'
                max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());

Change since v1:
1. only expose CONFIG_ZONE_DMA32 when CONFIG_EXPERT=y
2. remove redundant IS_ENABLED(CONFIG_ZONE_DMA32)

Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Miles Chen 2019-05-29 00:08:20 +08:00 committed by Catalin Marinas
parent f7f0097af6
commit 0c1f14ed12
2 changed files with 5 additions and 3 deletions
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3
arch/arm64/Kconfig
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@ -260,7 +260,8 @@ config GENERIC_CALIBRATE_DELAY
def_bool y
config ZONE_DMA32
def_bool y
bool "Support DMA32 zone" if EXPERT
default y
config HAVE_GENERIC_GUP
def_bool y

5
arch/arm64/mm/init.c
View File

@ -191,8 +191,9 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
unsigned long max_zone_pfns[MAX_NR_ZONES] = {0};
if (IS_ENABLED(CONFIG_ZONE_DMA32))
max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
#ifdef CONFIG_ZONE_DMA32
max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
#endif
max_zone_pfns[ZONE_NORMAL] = max;
free_area_init_nodes(max_zone_pfns);