Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds

[sfrench/cifs-2.6.git] / arch / ia64 / kernel / kprobes.c

diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 4f5fd0960ba7c0c7e1c44e0c358edff198e947f0..5dc98b5abcfbcc3de963e60faaa139d86d362170 100644 (file)
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -151,12 +151,12 @@ static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot,
 
        cmp_inst.l = kprobe_inst;
        if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) {
-               /* Integere compare - Register Register (A6 type)*/
+               /* Integer compare - Register Register (A6 type)*/
                if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0)
                                &&(cmp_inst.f.c == 1))
                        ctype_unc = 1;
        } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) {
-               /* Integere compare - Immediate Register (A8 type)*/
+               /* Integer compare - Immediate Register (A8 type)*/
                if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1))
                        ctype_unc = 1;
        }
@@ -370,14 +370,18 @@ static int __kprobes valid_kprobe_addr(int template, int slot,
 
 static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
-       kcb->prev_kprobe.kp = kprobe_running();
-       kcb->prev_kprobe.status = kcb->kprobe_status;
+       unsigned int i;
+       i = atomic_add_return(1, &kcb->prev_kprobe_index);
+       kcb->prev_kprobe[i-1].kp = kprobe_running();
+       kcb->prev_kprobe[i-1].status = kcb->kprobe_status;
 }
 
 static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
-       __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
-       kcb->kprobe_status = kcb->prev_kprobe.status;
+       unsigned int i;
+       i = atomic_sub_return(1, &kcb->prev_kprobe_index);
+       __get_cpu_var(current_kprobe) = kcb->prev_kprobe[i].kp;
+       kcb->kprobe_status = kcb->prev_kprobe[i].status;
 }
 
 static void __kprobes set_current_kprobe(struct kprobe *p,
@@ -816,7 +820,7 @@ out:
        return 1;
 }
 
-static int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr)
+int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr)
 {
        struct kprobe *cur = kprobe_running();
        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -900,13 +904,6 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
                        if (post_kprobes_handler(args->regs))
                                ret = NOTIFY_STOP;
                break;
-       case DIE_PAGE_FAULT:
-               /* kprobe_running() needs smp_processor_id() */
-               preempt_disable();
-               if (kprobe_running() &&
-                       kprobes_fault_handler(args->regs, args->trapnr))
-                       ret = NOTIFY_STOP;
-               preempt_enable();
        default:
                break;
        }
@@ -939,10 +936,15 @@ static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg)
        return;
 }
 
+unsigned long arch_deref_entry_point(void *entry)
+{
+       return ((struct fnptr *)entry)->ip;
+}
+
 int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
 {
        struct jprobe *jp = container_of(p, struct jprobe, kp);
-       unsigned long addr = ((struct fnptr *)(jp->entry))->ip;
+       unsigned long addr = arch_deref_entry_point(jp->entry);
        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
        struct param_bsp_cfm pa;
        int bytes;
@@ -950,7 +952,7 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
        /*
         * Callee owns the argument space and could overwrite it, eg
         * tail call optimization. So to be absolutely safe
-        * we save the argument space before transfering the control
+        * we save the argument space before transferring the control
         * to instrumented jprobe function which runs in
         * the process context
         */