x86: optimize page faults like all other achitectures and kill notifier cruft

x86(-64) are the last architectures still using the page fault notifier
cruft for the kprobes page fault hook.  This patch converts them to the
proper direct calls, and removes the now unused pagefault notifier bits
aswell as the cruft in kprobes.c that was related to this mess.

I know Andi didn't really like this, but all other architecture maintainers
agreed the direct calls are much better and besides the obvious cruft
removal a common way of dealing with kprobes across architectures is
important aswell.

[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: fix sparc64]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Andi Kleen <ak@suse.de>
Cc: <linux-arch@vger.kernel.org>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 0 insertions, 20 deletions

diff --git a/include/asm-powerpc/kdebug.h b/include/asm-powerpc/kdebug.h
index 295f016..ae6d206 100644
--- a/include/asm-powerpc/kdebug.h
+++ b/include/asm-powerpc/kdebug.h
@@ -2,25 +2,6 @@
 #define _ASM_POWERPC_KDEBUG_H
 #ifdef __KERNEL__
 
-/* nearly identical to x86_64/i386 code */
-
-#include <linux/notifier.h>
-
-/*
- * 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 powerpc_die_chain;
-
 /* Grossly misnamed. */
 enum die_val {
 	DIE_OOPS = 1,
diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h
index 8b08b44..c16973d 100644
--- a/include/asm-powerpc/kprobes.h
+++ b/include/asm-powerpc/kprobes.h
@@ -81,7 +81,6 @@ typedef unsigned int kprobe_opcode_t;
 #endif
 
 #define ARCH_SUPPORTS_KRETPROBES
-#define  ARCH_INACTIVE_KPROBE_COUNT 1
 #define flush_insn_slot(p)	do { } while (0)
 
 void kretprobe_trampoline(void);