linux-kernel - [PATCH] perf: fix perf_event

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Date:	Tue, 15 Dec 2009 19:36:19 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf: fix perf_event_attr layout

[now with lkml added too]

The miss-alignment of bp_addr created a 32bit hole, causing different
structure packings on 32 and 64 bit machines.

Fix that by moving __reserve_2 into that hole.

Further, remove the useless struct and redundant __bp_reserve muck.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 include/linux/perf_event.h |   12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

Index: linux-2.6/include/linux/perf_event.h
===================================================================
--- linux-2.6.orig/include/linux/perf_event.h
+++ linux-2.6/include/linux/perf_event.h
@@ -211,17 +211,11 @@ struct perf_event_attr {
 		__u32		wakeup_watermark; /* bytes before wakeup   */
 	};
 
-	struct { /* Hardware breakpoint info */
-		__u64		bp_addr;
-		__u32		bp_type;
-		__u32		bp_len;
-		__u64		__bp_reserved_1;
-		__u64		__bp_reserved_2;
-	};
-
 	__u32			__reserved_2;
 
-	__u64			__reserved_3;
+	__u64			bp_addr;
+	__u32			bp_type;
+	__u32			bp_len;
 };
 
 /*



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