[RFC PATCH 2/5] riscv: Define arch_apei_get_mem_attribute for RISC-V

[Ruidong Tian <tianruidong@linux.alibaba.com>]

From: Himanshu Chauhan <hchauhan@ventanamicro.com>

ghes_map function uses arch_apei_get_mem_attribute to get the
protection bits for a given physical address. These protection
bits are then used to map the physical address.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
---
 arch/riscv/include/asm/acpi.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h
index 6e13695120bc..0c599452ef48 100644
--- a/arch/riscv/include/asm/acpi.h
+++ b/arch/riscv/include/asm/acpi.h
@@ -27,6 +27,26 @@ extern int acpi_disabled;
 extern int acpi_noirq;
 extern int acpi_pci_disabled;
 
+#ifdef	CONFIG_ACPI_APEI
+/*
+ * acpi_disable_cmcff is used in drivers/acpi/apei/hest.c for disabling
+ * IA-32 Architecture Corrected Machine Check (CMC) Firmware-First mode
+ * with a kernel command line parameter "acpi=nocmcoff". But we don't
+ * have this IA-32 specific feature on ARM64, this definition is only
+ * for compatibility.
+ */
+#define acpi_disable_cmcff 1
+static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
+{
+	/*
+	 * Until we have a way to look for EFI memory attributes.
+	 */
+	return PAGE_KERNEL;
+}
+#else /* CONFIG_ACPI_APEI */
+#define acpi_disable_cmcff 0
+#endif /* !CONFIG_ACPI_APEI */
+
 static inline void disable_acpi(void)
 {
 	acpi_disabled = 1;
-- 
2.43.7