[PATCH 5/9] uprobes: allow arch-specific initialization

[rabin@rab.in (Rabin Vincent)]

Add a weak function for any architecture-specific initialization.  ARM
will use this to register the handlers for the undefined instructions it
uses to implement uprobes.

Signed-off-by: Rabin Vincent <rabin@rab.in>
---
 include/linux/uprobes.h |    1 +
 kernel/events/uprobes.c |   10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index b4380ad..c3dc5de 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -130,6 +130,7 @@ extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned l
 extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 extern bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
 extern void __weak arch_uprobe_xol_copy(struct arch_uprobe *auprobe, void *vaddr);
+extern int __weak arch_uprobes_init(void);
 #else /* !CONFIG_UPROBES */
 struct uprobes_state {
 };
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index f7ff3a4..ca000a9 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1634,8 +1634,14 @@ static struct notifier_block uprobe_exception_nb = {
 	.priority		= INT_MAX-1,	/* notified after kprobes, kgdb */
 };
 
+int __weak __init arch_uprobes_init(void)
+{
+	return 0;
+}
+
 static int __init init_uprobes(void)
 {
+	int ret;
 	int i;
 
 	for (i = 0; i < UPROBES_HASH_SZ; i++) {
@@ -1643,6 +1649,10 @@ static int __init init_uprobes(void)
 		mutex_init(&uprobes_mmap_mutex[i]);
 	}
 
+	ret = arch_uprobes_init();
+	if (ret)
+		return ret;
+
 	return register_die_notifier(&uprobe_exception_nb);
 }
 module_init(init_uprobes);
-- 
1.7.9.5