linux-kernel - [PATCH] perf: Fix sigbus with perf-top

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Date:	Wed, 18 Feb 2015 19:03:18 -0500
From:	David Ahern <david.ahern@...cle.com>
To:	acme@...nel.org, linux-kernel@...r.kernel.org
Cc:	David Ahern <david.ahern@...cle.com>
Subject: [PATCH] perf: Fix sigbus with perf-top

perf-top is terminating due to SIGBUS on sparc64. git bisect points to:

    commit 82396986032915c1572bfb74b224fcc2e4e8ba7c
    Author: Arnaldo Carvalho de Melo <acme@...hat.com>
    Date:   Mon Sep 8 13:26:35 2014 -0300

        perf evlist: Refcount mmaps

        We need to know how many fds are using a perf mmap via
        PERF_EVENT_IOC_SET_OUTPUT, so that we can know when to ditch an mmap,
        refcount it.

This commit added 'int refcnt' to struct perf_mmap and the addition makes the
event_copy element no longer 8-byte aligned. Fix by adding a pad.

Signed-off-by: David Ahern <david.ahern@...cle.com>
---
 tools/perf/util/evlist.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index c94a9e03ecf1..7a5a77b2b907 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -28,6 +28,7 @@ struct perf_mmap {
 	int		 mask;
 	int		 refcnt;
 	unsigned int	 prev;
+	int		 pad;
 	char		 event_copy[PERF_SAMPLE_MAX_SIZE];
 };
 
-- 
1.9.3

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