[PATCH 2/9] uprobes: check for single step support

[Rabin Vincent]

Check for single step support before calling user_enable_single_step(),
since user_enable_single_step() just BUG()s if support does not exist.
Needed by ARM.

Signed-off-by: Rabin Vincent <rabin at rab.in>
---
 kernel/events/uprobes.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 98256bc..db4e3ab 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1450,7 +1450,8 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
 
 void __weak arch_uprobe_enable_step(struct arch_uprobe *arch)
 {
-	user_enable_single_step(current);
+	if (arch_has_single_step())
+		user_enable_single_step(current);
 }
 
 void __weak arch_uprobe_disable_step(struct arch_uprobe *arch)
-- 
1.7.9.5