---

yaml
---
r: 46184
b: refs/heads/master
c: 162e006
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ab14de6c37fae22911ba99f4171613e6d758050b
+refs/heads/master: 162e006ef59266b9ebf34e3d15ca1f3d9ee956d7

trunk/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

trunk/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;
 }
 

trunk/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 = .;

trunk/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)

trunk/include/asm-s390/sections.h

@@ -3,4 +3,6 @@
 
 #include <asm-generic/sections.h>
 
+extern char _eshared[];
+
 #endif