From: Gerald BAEZA <[email protected]> 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 <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Alexandre Torgue <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Mathieu Poirier <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- 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 <linux/compiler.h> #include <sys/types.h> 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); -- 2.21.0
