linux-kernel - [PATCH 4.18 056/350] perf cpu_map: Align cpu map synthesized events properly.

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Date:   Sun, 11 Nov 2018 14:18:40 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jiri Olsa <jolsa@...nel.org>, Kan Liang <kan.liang@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.18 056/350] perf cpu_map: Align cpu map synthesized events properly.

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Miller <davem@...emloft.net>

[ Upstream commit 0ed149cf5239cc6e7e65bf00f769e8f1e91076c0 ]

The size of the resulting cpu map can be smaller than a multiple of
sizeof(u64), resulting in SIGBUS on cpus like Sparc as the next event
will not be aligned properly.

Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...el.com>
Fixes: 6c872901af07 ("perf cpu_map: Add cpu_map event synthesize function")
Link: http://lkml.kernel.org/r/20181011.224655.716771175766946817.davem@davemloft.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/perf/util/event.c |    1 +
 1 file changed, 1 insertion(+)

--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -1074,6 +1074,7 @@ void *cpu_map_data__alloc(struct cpu_map
 	}
 
 	*size += sizeof(struct cpu_map_data);
+	*size = PERF_ALIGN(*size, sizeof(u64));
 	return zalloc(*size);
 }