From d9c5c083416500e95da098c01be092b937def7fa Mon Sep 17 00:00:00 2001 From: Gerald BAEZA Date: Thu, 22 Aug 2019 09:07:01 +0000 Subject: [PATCH] libperf: Fix alignment trap with xyarray contents in 'perf stat' Following the patch 'perf stat: Fix --no-scale', an alignment trap happens in process_counter_values() on ARMv7 platforms due to the attempt to copy non 64 bits aligned double words (pointed by 'count') via a NEON vectored instruction ('vld1' with 64 bits alignment constraint). This patch sets a 64 bits alignment constraint on 'contents[]' field in 'struct xyarray' since the 'count' pointer used above points to such a structure. Signed-off-by: Gerald Baeza Cc: Alexander Shishkin Cc: Alexandre Torgue Cc: Andi Kleen Cc: Jiri Olsa Cc: Mathieu Poirier Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1566464769-16374-1-git-send-email-gerald.baeza@st.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/lib/include/internal/xyarray.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/lib/include/internal/xyarray.h b/tools/perf/lib/include/internal/xyarray.h index 3bf70e4d474c..51e35d6c8ec4 100644 --- a/tools/perf/lib/include/internal/xyarray.h +++ b/tools/perf/lib/include/internal/xyarray.h @@ -2,6 +2,7 @@ #ifndef __LIBPERF_INTERNAL_XYARRAY_H #define __LIBPERF_INTERNAL_XYARRAY_H +#include #include struct xyarray { @@ -10,7 +11,7 @@ struct xyarray { size_t entries; size_t max_x; size_t max_y; - char contents[]; + char contents[] __aligned(8); }; struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size);