On Wed, Feb 04, 2015 at 04:16:34PM +0000, Timur Tabi wrote: > On 02/04/2015 10:08 AM, Mark Salter wrote: > > acpi_os_remap() is used to map ACPI tables. These tables may be in ram > > which are already included in the kernel's linear RAM mapping. So we > > need ioremap_cache to avoid two mappings to the same physical page > > having different caching attributes. > > Would it be possible to modify ioremap() so that it can tell whether the > memory is already mapped in some way, and then use a compatible remapping? No. We have some semantics for ioremap() and it should return non-cacheable mapping. ioremap_cache() checks whether the page is RAM already and returns the existing kernel linear mapping on arm64. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
