[PATCH] perf bench: Fix trap divide error of perf bench internals inject-build-id

From: He Zhe
Date: Tue May 07 2024 - 02:51:24 EST


perf bench internals inject-build-id suffers from the following error when
only one DSO is collected.

perf bench internals inject-build-id -v
Collected 1 DSOs
traps: internals-injec[2305] trap divide error
ip:557566ba6394 sp:7ffd4de97fe0 error:0 in perf[557566b2a000+23d000]
Build-id injection benchmark
Iteration #1
Floating point exception

This patch removes the unnecessary minus one from the divisor which also
corrects the randomization range.

Signed-off-by: He Zhe <zhe.he@xxxxxxxxxxxxx>
---
tools/perf/bench/inject-buildid.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/bench/inject-buildid.c b/tools/perf/bench/inject-buildid.c
index 49331743c743..a759eb2328be 100644
--- a/tools/perf/bench/inject-buildid.c
+++ b/tools/perf/bench/inject-buildid.c
@@ -362,7 +362,7 @@ static int inject_build_id(struct bench_data *data, u64 *max_rss)
return -1;

for (i = 0; i < nr_mmaps; i++) {
- int idx = rand() % (nr_dsos - 1);
+ int idx = rand() % nr_dsos;
struct bench_dso *dso = &dsos[idx];
u64 timestamp = rand() % 1000000;

--
2.25.1