From: Mao Minkai <maominkai@wxiat.com> Sunway inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I56TYY -------------------------------- If memmap region and DMA region are overlapped, DMA region could be discontiguous. Send a warning to kernel log if this happens. Signed-off-by: Mao Minkai <maominkai@wxiat.com> Signed-off-by: Gu Zitao <guzitao@wxiat.com> Acked-by: Xie XiuQi <xiexiuqi@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- arch/sw_64/kernel/setup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/sw_64/kernel/setup.c b/arch/sw_64/kernel/setup.c index cc33a6f3b4f9..86cae2962e97 100644 --- a/arch/sw_64/kernel/setup.c +++ b/arch/sw_64/kernel/setup.c @@ -367,6 +367,7 @@ void __init process_memmap(void) static int i; // Make it static so we won't start over again every time. int ret; phys_addr_t base, size; + unsigned long dma_end __maybe_unused = virt_to_phys((void *)MAX_DMA_ADDRESS); if (!memblock_initialized) return; @@ -386,6 +387,9 @@ void __init process_memmap(void) if (ret) pr_err("reserve memmap region [mem %#018llx-%#018llx] failed\n", base, base + size - 1); + else if (IS_ENABLED(CONFIG_ZONE_DMA32) && (base < dma_end)) + pr_warn("memmap region [mem %#018llx-%#018llx] overlapped with DMA32 region\n", + base, base + size - 1); } break; case memmap_pci: -- 2.20.1