linux-kernel - [PATCH] perf: Align cpu map events properly.

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Message-Id: <20181011.224655.716771175766946817.davem@davemloft.net>
Date:   Thu, 11 Oct 2018 22:46:55 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     acme@...nel.org
CC:     linux-kernel@...r.kernel.org
Subject: [PATCH] perf: Align cpu map events properly.

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.

Fixes: 6c872901af07 ("perf cpu_map: Add cpu_map event synthesize function")
Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 0cd42150f712..0988eb3b844b 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -1081,6 +1081,7 @@ void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max
 	}

 	*size += sizeof(struct cpu_map_data);
+	*size = PERF_ALIGN(*size, sizeof(u64));
 	return zalloc(*size);
 }