forked from Minki/linux
selftests/bpf: Fix massive output from test_maps
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
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@ -1274,6 +1274,8 @@ static void __run_parallel(unsigned int tasks,
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pid_t pid[tasks];
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int i;
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fflush(stdout);
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for (i = 0; i < tasks; i++) {
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pid[i] = fork();
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if (pid[i] == 0) {
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