From: Leo Yan leo.yan@linaro.org
[ Upstream commit e1d380ea8b00db4bb14d1f513000d4b62aa9d3f0 ]
C standard claims "An object declared as type _Bool is large enough to store the values 0 and 1", bool type size can be 1 byte or larger than 1 byte. Thus it's uncertian for bool type size with different compilers.
This patch changes the bool type in structure perf_record_time_conv to __u8 type, and pads extra bytes for 8-byte alignment; this can give reliable structure size.
Fixes: d110162cafc8 ("perf tsc: Support cap_user_time_short for event TIME_CONV") Suggested-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Leo Yan leo.yan@linaro.org Acked-by: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Gustavo A. R. Silva gustavoars@kernel.org Cc: Ingo Molnar mingo@redhat.com Cc: Jiri Olsa jolsa@redhat.com Cc: Kan Liang kan.liang@linux.intel.com Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Steve MacLean Steve.MacLean@Microsoft.com Cc: Yonatan Goldschmidt yonatan.goldschmidt@granulate.io Link: https://lore.kernel.org/r/20210428120915.7123-2-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/lib/perf/include/perf/event.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h index d82054225fcc..48583e441d9b 100644 --- a/tools/lib/perf/include/perf/event.h +++ b/tools/lib/perf/include/perf/event.h @@ -346,8 +346,9 @@ struct perf_record_time_conv { __u64 time_zero; __u64 time_cycles; __u64 time_mask; - bool cap_user_time_zero; - bool cap_user_time_short; + __u8 cap_user_time_zero; + __u8 cap_user_time_short; + __u8 reserved[6]; /* For alignment */ };
struct perf_record_header_feature {