38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
From bac633a6bb60b6b8542348ea3f61c367eae14f7c Mon Sep 17 00:00:00 2001
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From: Jerome Marchand <jmarchan@redhat.com>
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Date: Wed, 3 Jul 2019 11:12:08 +0200
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Subject: [PATCH] tools: fix runqslower warning
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The state member of task_struct is volatile and it's use as the last
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parameter of bpf_probe_read (const void *) triggers the following
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clang warning (LLVM 8):
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/virtual/main.c:56:42: warning: passing 'volatile long *' to parameter of type 'const void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
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bpf_probe_read(&state, sizeof(long), &prev->state);
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^~~~~~~~~~~~
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1 warning generated.
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Tracing run queue latency higher than 10000 us
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TIME COMM PID LAT(us)
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An explicit cast fixes the warning.
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---
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tools/runqslower.py | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/tools/runqslower.py b/tools/runqslower.py
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index 1d48be8a..5f5c3b9b 100755
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--- a/tools/runqslower.py
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+++ b/tools/runqslower.py
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@@ -167,7 +167,7 @@ RAW_TRACEPOINT_PROBE(sched_switch)
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long state;
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// ivcsw: treat like an enqueue event and store timestamp
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- bpf_probe_read(&state, sizeof(long), &prev->state);
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+ bpf_probe_read(&state, sizeof(long), (const void *)&prev->state);
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if (state == TASK_RUNNING) {
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bpf_probe_read(&tgid, sizeof(prev->tgid), &prev->tgid);
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bpf_probe_read(&pid, sizeof(prev->pid), &prev->pid);
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--
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2.20.1
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