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>

1 files changed, 1 insertions, 5 deletions

diff --git a/include/asm-x86/kdebug_64.h b/include/asm-x86/kdebug_64.h
index d7e2bcf49e4..df413e05375 100644
--- a/include/asm-x86/kdebug_64.h
+++ b/include/asm-x86/kdebug_64.h
@@ -1,13 +1,10 @@
 #ifndef _X86_64_KDEBUG_H
 #define _X86_64_KDEBUG_H 1
 
-#include <linux/notifier.h>
+#include <linux/compiler.h>
 
 struct pt_regs;
 
-extern int register_page_fault_notifier(struct notifier_block *);
-extern int unregister_page_fault_notifier(struct notifier_block *);
-
 /* Grossly misnamed. */
 enum die_val {
 	DIE_OOPS = 1,
@@ -22,7 +19,6 @@ enum die_val {
 	DIE_GPF,
 	DIE_CALL,
 	DIE_NMI_IPI,
-	DIE_PAGE_FAULT,
 };
 
 extern void printk_address(unsigned long address);