5 files changed, 31 insertions, 11 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 40dd47970a33..e518dd53eff5 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -27,7 +27,6 @@
 #define DEFSYS_CMD_SIZE         96
 #define SAVESYS_CMD_SIZE        32
 
-extern int _eshared;
 char kernel_nss_name[NSS_NAME_SIZE + 1];
 
 #ifdef CONFIG_SHARED_KERNEL
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index b2e1dc89a8c6..a466bab6677e 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -155,15 +155,34 @@ void __kprobes get_instruction_type(struct arch_specific_insn *ainsn)
 static int __kprobes swap_instruction(void *aref)
 {
         struct ins_replace_args *args = aref;
+        u32 *addr;
+        u32 instr;
         int err = -EFAULT;
 
+        /*
+         * Text segment is read-only, hence we use stura to bypass dynamic
+         * address translation to exchange the instruction. Since stura
+         * always operates on four bytes, but we only want to exchange two
+         * bytes do some calculations to get things right. In addition we
+         * shall not cross any page boundaries (vmalloc area!) when writing
+         * the new instruction.
+         */
+        addr = (u32 *)ALIGN((unsigned long)args->ptr, 4);
+        if ((unsigned long)args->ptr & 2)
+                instr = ((*addr) & 0xffff0000) | args->new;
+        else
+                instr = ((*addr) & 0x0000ffff) | args->new << 16;
+
         asm volatile(
-                "0: mvc  0(2,%2),0(%3)\n"
-                "1: la   %0,0\n"
+                "       lra     %1,0(%1)\n"
+                "0:     stura   %2,%1\n"
+                "1:     la      %0,0\n"
                 "2:\n"
                 EX_TABLE(0b,2b)
-                : "+d" (err), "=m" (*args->ptr)
-                : "a" (args->ptr), "a" (&args->new), "m" (args->new));
+                : "+d" (err)
+                : "a" (addr), "d" (instr)
+                : "memory", "cc");
+
         return err;
 }
 
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index 8fedb1f9fc97..a48907392522 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -35,9 +35,10 @@ SECTIONS
 
 #ifdef CONFIG_SHARED_KERNEL
   . = ALIGN(1048576);           /* VM shared segments are 1MB aligned */
+#endif
 
+  . = ALIGN(4096);
   _eshared = .;                 /* End of shareable data */
-#endif
 
   . = ALIGN(16);                /* Exception table */
   __start___ex_table = .;
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 162a338a5575..b3e7c45efb63 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -26,7 +26,6 @@
 #include <linux/pfn.h>
 #include <linux/poison.h>
 #include <linux/initrd.h>
-
 #include <asm/processor.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -96,8 +95,8 @@ static void __init setup_ro_region(void)
         pte_t new_pte;
         unsigned long address, end;
 
-        address = ((unsigned long)&__start_rodata) & PAGE_MASK;
-        end = PFN_ALIGN((unsigned long)&__end_rodata);
+        address = ((unsigned long)&_stext) & PAGE_MASK;
+        end = PFN_ALIGN((unsigned long)&_eshared);
 
         for (; address < end; address += PAGE_SIZE) {
                 pgd = pgd_offset_k(address);
@@ -173,8 +172,8 @@ void __init mem_init(void)
                 datasize >>10,
                 initsize >> 10);
         printk("Write protected kernel read-only data: %#lx - %#lx\n",
-               (unsigned long)&__start_rodata,
-               PFN_ALIGN((unsigned long)&__end_rodata) - 1);
+               (unsigned long)&_stext,
+               PFN_ALIGN((unsigned long)&_eshared) - 1);
 }
 
 void free_initmem(void)
diff --git a/include/asm-s390/sections.h b/include/asm-s390/sections.h
index 3a0b8ffeab7a..1c5a2c4ccdad 100644
--- a/include/asm-s390/sections.h
+++ b/include/asm-s390/sections.h
@@ -3,4 +3,6 @@
 
 #include <asm-generic/sections.h>
 
+extern char _eshared[];
+
 #endif