From: Ian Rogers irogers@google.com
commit d2c73501a767514b6c85c7feff9457a165d51057 upstream.
Memory sanitizer warns if a write is performed where the memory being read for the write is uninitialized. Avoid this warning by initializing the memory.
Signed-off-by: Ian Rogers irogers@google.com Acked-by: Jiri Olsa jolsa@redhat.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Stephane Eranian eranian@google.com Link: http://lore.kernel.org/lkml/20200912053725.1405857-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: Anders Roxell anders.roxell@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/perf/bench/sched-messaging.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/tools/perf/bench/sched-messaging.c +++ b/tools/perf/bench/sched-messaging.c @@ -66,11 +66,10 @@ static void fdpair(int fds[2]) /* Block until we're ready to go */ static void ready(int ready_out, int wakefd) { - char dummy; struct pollfd pollfd = { .fd = wakefd, .events = POLLIN };
/* Tell them we're ready. */ - if (write(ready_out, &dummy, 1) != 1) + if (write(ready_out, "R", 1) != 1) err(EXIT_FAILURE, "CLIENT: ready write");
/* Wait for "GO" signal */ @@ -85,6 +84,7 @@ static void *sender(struct sender_contex unsigned int i, j;
ready(ctx->ready_out, ctx->wakefd); + memset(data, 'S', sizeof(data));
/* Now pump to every receiver. */ for (i = 0; i < nr_loops; i++) {