v4.19.13 snapshot.
diff --git a/arch/mips/include/asm/edac.h b/arch/mips/include/asm/edac.h
new file mode 100644
index 0000000..fc46776
--- /dev/null
+++ b/arch/mips/include/asm/edac.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_EDAC_H
+#define ASM_EDAC_H
+
+#include <asm/compiler.h>
+
+/* ECC atomic, DMA, SMP and interrupt safe scrub function */
+
+static inline void edac_atomic_scrub(void *va, u32 size)
+{
+ unsigned long *virt_addr = va;
+ unsigned long temp;
+ u32 i;
+
+ for (i = 0; i < size / sizeof(unsigned long); i++) {
+ /*
+ * Very carefully read and write to memory atomically
+ * so we are interrupt, DMA and SMP safe.
+ *
+ * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
+ */
+
+ __asm__ __volatile__ (
+ " .set mips2 \n"
+ "1: ll %0, %1 # edac_atomic_scrub \n"
+ " addu %0, $0 \n"
+ " sc %0, %1 \n"
+ " beqz %0, 1b \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
+ : GCC_OFF_SMALL_ASM() (*virt_addr));
+
+ virt_addr++;
+ }
+}
+
+#endif