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ARM: ignore memory below PHYS_OFFSET

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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>
This commit is contained in:
Russell King 2014-01-11 11:22:18 +00:00
parent 1096813131
commit 571b143750
1 changed files with 14 additions and 0 deletions
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14
arch/arm/kernel/setup.c
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@ -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);