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

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Date: Tue,  7 May 2024 14:50:26 +0800
From: He Zhe <zhe.he@...driver.com>
To: namhyung@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        irogers@...gle.com, adrian.hunter@...el.com
Cc: zhe.he@...driver.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] perf bench: Fix trap divide error of perf bench internals inject-build-id

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@...driver.com>
---
 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