[v2,0/3] arm64: mm: reserve CMA and crashkernel in ZONE_DMA if enabled

Message

chenzhou Dec. 30, 2020, 10:23 a.m. UTC

Currently, CMA and crashkernel are reserved in ZONE_DMA32, which
is OK for majority of devices. But the ones that need them in ZONE_DMA
need to configure it explicitly.

Since patchset "arm64: Default to 32-bit wide ZONE_DMA", ZONE_DMA's
size is fine-tuned. So we could directly reserve CMA and crashkernel
in ZONE_DMA if CONFIG_ZONE_DMA is enabled, otherwise, reserving in
ZONE_DMA32.

Patch 1 updates the comments about the ZONE_DMA.
Patch 2 move dma_contiguous_reserve() to bootmem_init()
Patch 3 reserve CMA and crashkernel in ZONE_DMA if enabled

Changes since v1:
- Add Reviewed-by for patch 1 from Nicolas.
- Suggested by Nicolas, also reserve CMA in ZONE_DMA if enabled.

Chen Zhou (3):
  arm64: mm: update the comments about ZONE_DMA
  arm64: mm: move dma_contiguous_reserve() to bootmem_init()
  arm64: mm: reserve CMA and crashkernel in ZONE_DMA if enabled

 arch/arm64/mm/init.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)