diff options
author | Christoph Hellwig <hch@lst.de> | 2007-05-16 14:52:19 +0200 |
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committer | Tony Luck <tony.luck@intel.com> | 2007-05-16 09:00:51 -0700 |
commit | 576fe0bd7e52dce7afb6b9b2450744555b2eb53a (patch) | |
tree | acf2a5f8d7f7906cfa2da9bf53a74d8e3fcd42bb /arch/ia64/mm/fault.c | |
parent | 17028c5c91580036eb41da2fad292965fa3b9a7d (diff) | |
download | linux-576fe0bd7e52dce7afb6b9b2450744555b2eb53a.tar.bz2 |
[IA64] optimize pagefaults a little
Get rid of the notifier list and call the kprobes code directly
if compiled in. This mirrors the changes that recently went
into powerpc, s390 and sparc64.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/mm/fault.c')
-rw-r--r-- | arch/ia64/mm/fault.c | 41 |
1 files changed, 14 insertions, 27 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c index 21658e02116c..b87f785c2416 100644 --- a/arch/ia64/mm/fault.c +++ b/arch/ia64/mm/fault.c @@ -19,36 +19,24 @@ extern void die (char *, struct pt_regs *, long); #ifdef CONFIG_KPROBES -ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain); - -/* Hook to register for page fault notifications */ -int register_page_fault_notifier(struct notifier_block *nb) -{ - return atomic_notifier_chain_register(¬ify_page_fault_chain, nb); -} - -int unregister_page_fault_notifier(struct notifier_block *nb) +static inline int notify_page_fault(struct pt_regs *regs, int trap) { - return atomic_notifier_chain_unregister(¬ify_page_fault_chain, nb); -} + int ret = 0; + + if (!user_mode(regs)) { + /* kprobe_running() needs smp_processor_id() */ + preempt_disable(); + if (kprobe_running() && kprobes_fault_handler(regs, trap)) + ret = 1; + preempt_enable(); + } -static inline int notify_page_fault(enum die_val val, const char *str, - struct pt_regs *regs, long err, int trap, int sig) -{ - struct die_args args = { - .regs = regs, - .str = str, - .err = err, - .trapnr = trap, - .signr = sig - }; - return atomic_notifier_call_chain(¬ify_page_fault_chain, val, &args); + return ret; } #else -static inline int notify_page_fault(enum die_val val, const char *str, - struct pt_regs *regs, long err, int trap, int sig) +static inline int notify_page_fault(struct pt_regs *regs, int trap) { - return NOTIFY_DONE; + return 0; } #endif @@ -117,8 +105,7 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re /* * This is to handle the kprobes on user space access instructions */ - if (notify_page_fault(DIE_PAGE_FAULT, "page fault", regs, code, TRAP_BRKPT, - SIGSEGV) == NOTIFY_STOP) + if (notify_page_fault(regs, TRAP_BRKPT)) return; down_read(&mm->mmap_sem); |