memtester (https://pyropus.ca./software/memtester/) hack for disabling bad RAM until next reboot

memtester-badram-offline-hack.diff

--- memtester-orig/memtester-4.3.0/tests.c	2012-06-09 23:45:22.000000000 +0200
+++ memtester-4.3.0/tests.c	2018-06-24 18:08:03.194020598 +0200
@@ -11,14 +11,17 @@
  * This file contains the functions for the actual tests, called from the
  * main routine in memtester.c.  See other comments in that file.
  *
  */
 
+#define _GNU_SOURCE
 #include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <limits.h>
+#include <sys/mman.h>
+#define MADV_SOFT_OFFLINE 101
 
 #include "types.h"
 #include "sizes.h"
 #include "memtester.h"
 
@@ -46,10 +49,14 @@
                         (ul) *p1, (ul) *p2, physaddr);
             } else {
                 fprintf(stderr, 
                         "FAILURE: 0x%08lx != 0x%08lx at offset 0x%08lx.\n", 
                         (ul) *p1, (ul) *p2, (ul) (i * sizeof(ul)));
+		void *page1 = (void*)(((unsigned long)p1) & ~0xfffUL);
+		void *page2 = (void*)(((unsigned long)p2) & ~0xfffUL);
+		if (madvise(page1, 0x1000, MADV_SOFT_OFFLINE)) perror("madvise1");
+		if (madvise(page2, 0x1000, MADV_SOFT_OFFLINE)) perror("madvise1");
             }
             /* printf("Skipping to next test..."); */
             r = -1;
         }
     }