hw-breakpoints: Zeroe the breakpoint attrs on initialization

The perf attrs used to set up breakpoint parameters are often allocated
in the stack and not zeroed out before calling hw_breakpoint_init().
Handle it from this helper to avoid random attributes set by the stack.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>

diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index 4d14a38..42da1ce 100644 (file)
--- a/include/linux/hw_breakpoint.h
+++ b/include/linux/hw_breakpoint.h
@@ -22,6 +22,8 @@ enum {
 
 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
 {
+       memset(attr, 0, sizeof(*attr));
+
        attr->type = PERF_TYPE_BREAKPOINT;
        attr->size = sizeof(*attr);
        /*