linux-kernel - [PATCH 1/2] hw-breakpoints: Zeroe the breakpoint attrs on initialization

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Message-Id: <1260166977-5894-2-git-send-regression-fweisbec@gmail.com>
Date:	Mon,  7 Dec 2009 07:22:56 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Walt <w41ter@...il.com>, Prasad <prasad@...ux.vnet.ibm.com>
Subject: [PATCH 1/2] 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@...il.com>
Cc: Prasad <prasad@...ux.vnet.ibm.com>
---
 include/linux/hw_breakpoint.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index 4d14a38..42da1ce 100644
--- 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);
 	/*
-- 
1.6.2.3

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