[S390] get rid of kprobes notifier call chain.

And here's a port of the powerpc patch to get rid of the notifier
chain completely to s390.  It's ontop of Martins patch as that one
is in mainline already.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 19 insertions, 15 deletions

diff --git a/include/asm-s390/kdebug.h b/include/asm-s390/kdebug.h
index 1b50f89819a4..d2d7ad276148 100644
--- a/include/asm-s390/kdebug.h
+++ b/include/asm-s390/kdebug.h
@@ -22,8 +22,21 @@ struct die_args {
  */
 extern int register_die_notifier(struct notifier_block *);
 extern int unregister_die_notifier(struct notifier_block *);
-extern int register_page_fault_notifier(struct notifier_block *);
-extern int unregister_page_fault_notifier(struct notifier_block *);
+
+/*
+ * These are only here because kprobes.c wants them to implement a
+ * blatant layering violation. Will hopefully go away soon once all
+ * architectures are updated.
+ */
+static inline int register_page_fault_notifier(struct notifier_block *nb)
+{
+        return 0;
+}
+static inline int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+        return 0;
+}
+
 extern struct atomic_notifier_head s390die_chain;
 
 enum die_val {
@@ -39,7 +52,6 @@ enum die_val {
         DIE_GPF,
         DIE_CALL,
         DIE_NMI_IPI,
-        DIE_PAGE_FAULT,
 };
 
 static inline int notify_die(enum die_val val, const char *str,
diff --git a/include/asm-s390/kprobes.h b/include/asm-s390/kprobes.h
index b847ff0ec3fa..830fe4c4eea6 100644
--- a/include/asm-s390/kprobes.h
+++ b/include/asm-s390/kprobes.h
@@ -97,18 +97,10 @@ void kretprobe_trampoline(void);
 int  is_prohibited_opcode(kprobe_opcode_t *instruction);
 void get_instruction_type(struct arch_specific_insn *ainsn);
 
+int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
+int kprobe_exceptions_notify(struct notifier_block *self,
+        unsigned long val, void *data);
+
 #define flush_insn_slot(p)      do { } while (0)
 
 #endif  /* _ASM_S390_KPROBES_H */
-
-#ifdef CONFIG_KPROBES
-
-extern int kprobe_exceptions_notify(struct notifier_block *self,
-                                        unsigned long val, void *data);
-#else   /* !CONFIG_KPROBES */
-static inline int kprobe_exceptions_notify(struct notifier_block *self,
-                                                unsigned long val, void *data)
-{
-        return 0;
-}
-#endif