ARM: ignore memory below PHYS_OFFSET (571b1437) · Commits · 戴 / test

If the kernel is loaded higher in physical memory than normal, and we calculate PHYS_OFFSET higher than the start of RAM, this leads to boot problems as we attempt to map part of this RAM into userspace. Rather than struggle with this, just truncate the mapping. Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/setup.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -660,6 +660,20 @@ int __init arm_add_memory(u64 start, u64 size)
		}
		#endif

		if (aligned_start < PHYS_OFFSET) {
		if (aligned_start + size <= PHYS_OFFSET) {
		pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
		aligned_start, aligned_start + size);
		return -EINVAL;
		}

		pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
		aligned_start, (u64)PHYS_OFFSET);

		size -= PHYS_OFFSET - aligned_start;
		aligned_start = PHYS_OFFSET;
		}

		bank->start = aligned_start;
		bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1);

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