From 9f90b997de4efd5404a8c52f89c400f0f4e2d216 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 30 Apr 2007 11:56:46 +0100 Subject: [POWERPC] Minor fault path optimization Call the kprobes pagefault handler directly instead of going through the complex notifier chain. Signed-off-by: Christoph Hellwig Signed-off-by: Paul Mackerras --- include/asm-powerpc/kdebug.h | 17 ++++++++++++++--- include/asm-powerpc/kprobes.h | 1 + 2 files changed, 15 insertions(+), 3 deletions(-) (limited to 'include') diff --git a/include/asm-powerpc/kdebug.h b/include/asm-powerpc/kdebug.h index 532bfee934f4..df996b933def 100644 --- a/include/asm-powerpc/kdebug.h +++ b/include/asm-powerpc/kdebug.h @@ -18,8 +18,20 @@ 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 powerpc_die_chain; /* Grossly misnamed. */ @@ -29,7 +41,6 @@ enum die_val { DIE_DABR_MATCH, DIE_BPT, DIE_SSTEP, - DIE_PAGE_FAULT, }; static inline int notify_die(enum die_val val,char *str,struct pt_regs *regs,long err,int trap, int sig) diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h index fc713e595982..b0e40ff32ee0 100644 --- a/include/asm-powerpc/kprobes.h +++ b/include/asm-powerpc/kprobes.h @@ -116,5 +116,6 @@ struct kprobe_ctlblk { extern int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data); +extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_KPROBES_H */ -- cgit v1.2.2