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From 795433f50f20ef7598db5cfe991b5386e4080d41 Mon Sep 17 00:00:00 2001
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From: Marcelo Tosatti <mtosatti@redhat.com>
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Date: Fri, 28 Jan 2022 15:39:59 -0300
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Subject: [PATCH 2/2] rt-numa: ignore runtime cpumask if -a CPULIST is
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specified
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When using isolcpus kernel command line option, the CPUs
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specified at isolcpus= are not part of the run time environment
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cpumask.
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This causes "cyclictest -a isolatedcpus" to fail with:
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WARN: Couldn't setaffinity in main thread: Invalid argument
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FATAL: No allowable cpus to run on
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# /dev/cpu_dma_latency set to 0us
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To fix this, ignore the runtime cpumask if neither "+", "!"
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are specified in the cpu list string.
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Suggested by Sebastian Andrzej Siewior.
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Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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v2: fix changelog typo
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v3: simplified version (John Kacur)
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Signed-off-by: John Kacur <jkacur@redhat.com>
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---
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src/lib/rt-numa.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/lib/rt-numa.c b/src/lib/rt-numa.c
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index ee5ab99684d8..3eead80c3b2b 100644
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--- a/src/lib/rt-numa.c
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+++ b/src/lib/rt-numa.c
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@@ -131,7 +131,8 @@ int parse_cpumask(char *str, int max_cpus, struct bitmask **cpumask)
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return 0;
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}
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- use_current_cpuset(max_cpus, mask);
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+ if (strchr(str, '!') != NULL || strchr(str, '+') != NULL)
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+ use_current_cpuset(max_cpus, mask);
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*cpumask = mask;
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return 0;
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--
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2.34.1
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