As pointed out by Qian Cai[1] the series enabling ZONE_DMA in arm64 breaks CMA/crashkernel reservations on large devices, as it changed its default placement. After discussing it with Catalin Marinas we're restoring the old behavior. The Raspberry Pi 4, being the only device that needs CMA and crashkernel in ZONE_DMA will explicitly do so trough it's device tree. [1] https://lkml.org/lkml/2019/10/21/725 --- Changes since v1: - Move CMA area registration into bcm2711.dtsi Nicolas Saenz Julienne (2): ARM: dts: bcm2711: force CMA into first GB of memory arm64: mm: reserve CMA and crashkernel in ZONE_DMA32 arch/arm/boot/dts/bcm2711.dtsi | 20 ++++++++++++++++++++ arch/arm64/mm/init.c | 4 ++-- 2 files changed, 22 insertions(+), 2 deletions(-) -- 2.23.0
