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selftests/bpf: Fix massive output from test_maps

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[ Upstream commit fa4505675e093e895b7ec49a76d44f6b5ad9602e ]

When stdout output from the selftests tool 'test_maps' gets redirected
into e.g file or pipe, then the output lines increase a lot (from 21
to 33949 lines).  This is caused by the printf that happens before the
fork() call, and there are user-space buffered printf data that seems
to be duplicated into the forked process.

To fix this fflush() stdout before the fork loop in __run_parallel().

Fixes: 1a97cf1fe5 ("selftests/bpf: speedup test_maps")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/159842985651.1050885.2154399297503372406.stgit@firesoul
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jesper Dangaard Brouer 2020-08-26 10:17:36 +02:00 • committed by Greg Kroah-Hartman
commit c4a427b71c
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/bpf/test_maps.c
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@ -1282,6 +1282,8 @@ static void __run_parallel(unsigned int tasks,
pid_t pid[tasks];
int i;
fflush(stdout);
for (i = 0; i < tasks; i++) {
pid[i] = fork();
if (pid[i] == 0) {