From: Mark Salter msalter@redhat.com
The acpi_os_ioremap() function may be used to map normal RAM or IO regions. The current implementation simply uses ioremap_cache(). This will work for some architectures, but arm64 ioremap_cache() cannot be used to map IO regions which don't support caching. So for arm64, use ioremap() for non-RAM regions.
Signed-off-by: Mark Salter msalter@redhat.com --- include/acpi/acpi_io.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/include/acpi/acpi_io.h b/include/acpi/acpi_io.h index 444671e..9d573db 100644 --- a/include/acpi/acpi_io.h +++ b/include/acpi/acpi_io.h @@ -1,11 +1,17 @@ #ifndef _ACPI_IO_H_ #define _ACPI_IO_H_
+#include <linux/mm.h> #include <linux/io.h>
static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) { +#ifdef CONFIG_ARM64 + if (!page_is_ram(phys >> PAGE_SHIFT)) + return ioremap(phys, size); +#endif + return ioremap_cache(phys, size); }