linux-kernel - [tip:perf/urgent] perf top: Fix SIGBUS on sparc64

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Message-ID: <tip-a73b6c199a663d64a38198f547d5c5be42163193@git.kernel.org>
Date:	Sun, 1 Mar 2015 08:50:38 -0800
From:	tip-bot for David Ahern <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, david.ahern@...cle.com,
	acme@...hat.com, mingo@...nel.org, hpa@...or.com,
	tglx@...utronix.de
Subject: [tip:perf/urgent] perf top: Fix SIGBUS on sparc64

Commit-ID:  a73b6c199a663d64a38198f547d5c5be42163193
Gitweb:     http://git.kernel.org/tip/a73b6c199a663d64a38198f547d5c5be42163193
Author:     David Ahern <david.ahern@...cle.com>
AuthorDate: Wed, 18 Feb 2015 19:03:18 -0500
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 25 Feb 2015 17:37:44 -0300

perf top: Fix SIGBUS on sparc64

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 __attribute__((aligned(8))) to the event_copy struct
member.

Signed-off-by: David Ahern <david.ahern@...cle.com>
Link: http://lkml.kernel.org/r/1424304198-92028-1-git-send-email-david.ahern@oracle.com
[ Switched from 'int pad;' to using __attribute__, David tested/acked that ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index c94a9e0..e99a676 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -28,7 +28,7 @@ struct perf_mmap {
 	int		 mask;
 	int		 refcnt;
 	unsigned int	 prev;
-	char		 event_copy[PERF_SAMPLE_MAX_SIZE];
+	char		 event_copy[PERF_SAMPLE_MAX_SIZE] __attribute__((aligned(8)));
 };
 
 struct perf_evlist {
--
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