Andrew Morton <[email protected]> writes:
>
> void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
> {
> + /* Don't unmap memory which was not mapped by acpi_os_map_memory */
> + if (efi_enabled &&
> + (efi_mem_attributes(virt_to_phys(virt)) & EFI_MEMORY_WB))
> + return;
The patch is wrong because if the address came from ioremap
virt_to_phys doesn't give the real physical address. Also looking
at acpi_os_map_memory it doesn't quite match the logic there.
One working way to check for ioremap memory is
virt >= VMALLOC_START && virt < VMALLOC_END
-Andi
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