Unverified Commit 10197129 authored by Yunhui Cui's avatar Yunhui Cui Committed by Palmer Dabbelt
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riscv: add a warning when physical memory address overflows 



The part of physical memory that exceeds the size of the linear mapping
will be discarded. When the system starts up normally, a warning message
will be printed to prevent confusion caused by the mismatch between the
system memory and the actual physical memory.

Signed-off-by: default avatarYunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240814062625.19794-1-cuiyunhui@bytedance.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent b6de116e

arch/riscv/mm/init.c

+6 −2
Original line number Diff line number Diff line
@@ -256,8 +256,12 @@ static void __init setup_bootmem(void) 
	 */

	if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) {

		max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE;

		if (memblock_end_of_DRAM() > max_mapped_addr) {

			memblock_cap_memory_range(phys_ram_base,

						  max_mapped_addr - phys_ram_base);

			pr_warn("Physical memory overflows the linear mapping size: region above %pa removed",

				&max_mapped_addr);

		}

	}



	/*

scripts/selinux/genheaders/genheaders

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+88 KiB

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