https://lkml.org/lkml/2011/8/23/21
https://lkml.org/lkml/diff/2011/8/23/21/1

diff -Naurp util-linux-2.19/config.h.in util-linux-2.19.oden/config.h.in
--- util-linux-2.19/config.h.in	2011-02-10 08:30:17.000000000 +0000
+++ util-linux-2.19.oden/config.h.in	2012-01-11 16:02:54.000000000 +0000
@@ -66,6 +66,10 @@
    you don't. */
 #undef HAVE_DECL_STICKY_TIMEOUTS
 
+/* Define to 1 if you have the declaration of `UNAME26', and to 0 if you
+   don't. */
+#undef HAVE_DECL_UNAME26
+
 /* Define to 1 if you have the declaration of `WHOLE_SECONDS', and to 0 if you
    don't. */
 #undef HAVE_DECL_WHOLE_SECONDS
diff -Naurp util-linux-2.19/configure.ac util-linux-2.19.oden/configure.ac
--- util-linux-2.19/configure.ac	2011-02-10 08:28:20.000000000 +0000
+++ util-linux-2.19.oden/configure.ac	2012-01-11 16:02:58.000000000 +0000
@@ -785,6 +785,7 @@ AC_CHECK_MEMBERS([struct stat.st_mtim.tv
 	[#include <sys/stat.h>])
 
 AC_CHECK_DECLS([
+ UNAME26,
  ADDR_NO_RANDOMIZE,
  FDPIC_FUNCPTRS,
  MMAP_PAGE_ZERO,
diff -Naurp util-linux-2.19/sys-utils/setarch.8 util-linux-2.19.oden/sys-utils/setarch.8
--- util-linux-2.19/sys-utils/setarch.8	2010-11-30 10:26:32.000000000 +0000
+++ util-linux-2.19.oden/sys-utils/setarch.8	2012-01-11 16:03:04.000000000 +0000
@@ -29,6 +29,9 @@ Be verbose.
 .I "\-h," "\-\-help"
 Display help (it is also displayed when setarch takes no arguments).
 .TP
+.I "\-\-uname\-2.6"
+Causes the program to see a kernel version number beginning with 2.6.
+.TP
 .I "\-3," "\-\-3gb"
 Specifies that processes should use a maximum of 3GB of address space on systems where it is supported (ADDR_LIMIT_3GB).
 .TP
diff -Naurp util-linux-2.19/sys-utils/setarch.c util-linux-2.19.oden/sys-utils/setarch.c
--- util-linux-2.19/sys-utils/setarch.c	2010-11-30 10:26:32.000000000 +0000
+++ util-linux-2.19.oden/sys-utils/setarch.c	2012-01-11 16:04:39.000000000 +0000
@@ -39,9 +39,11 @@
 
 #define set_pers(pers) ((long)syscall(SYS_personality, pers))
 
-/* Option --4gb has no equivalent short option, use a non-character as a
-   pseudo short option. */
-#define OPT_4GB (CHAR_MAX+1)
+/* Options without equivalent short options */
+enum {
+	OPT_4GB		= CHAR_MAX + 1,
+	OPT_UNAME26
+};
 
 #define turn_on(_flag, _opts) \
 	do { \
@@ -51,6 +53,9 @@
 	} while(0)
 
 
+#if !HAVE_DECL_UNAME26
+# define UNAME26                 0x0020000
+#endif
 #if !HAVE_DECL_ADDR_NO_RANDOMIZE
 # define ADDR_NO_RANDOMIZE       0x0040000
 #endif
@@ -99,6 +104,7 @@ struct option longopts[] =
     { "sticky-timeouts",    0, 0, 'T' },
     { "3gb",                0, 0, '3' },
     { "4gb",                0, 0, OPT_4GB },
+    { "uname-2.6",          0, 0, OPT_UNAME26 },
     { NULL,                 0, 0, 0 }
 };
 
@@ -128,6 +134,9 @@ show_help(void)
    " -3, --3gb                limits the used address space to a maximum of 3 GB\n"
    "     --4gb                ignored (for backward compatibility only)\n"));
 
+   printf(_(
+   "     --uname-2.6          turns on UNAME26\n"));
+
   printf(_("\nFor more information see setarch(8).\n"));
   exit(EXIT_SUCCESS);
 }
@@ -308,6 +317,9 @@ int main(int argc, char *argv[])
 	break;
     case OPT_4GB:          /* just ignore this one */
       break;
+    case OPT_UNAME26:
+	turn_on(UNAME26, options);
+	break;
     }
   }