Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 5/6] rcu/nocb: Allow empty "rcu_nocbs" kernel parameter | Date | Wed, 17 Nov 2021 16:56:36 +0100 |
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If a user wants to boot without any CPU in offloaded mode initially but with the possibility to offload them later using cpusets, provide a way to simply pass an empty "rcu_nocbs" kernel parameter which will enforce the creation of dormant nocb kthreads.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Uladzislau Rezki <urezki@gmail.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Joel Fernandes <joel@joelfernandes.org> --- kernel/rcu/tree_nocb.h | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 1871f15b8472..3845f1885ffc 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -66,14 +66,16 @@ static bool rcu_nocb_is_setup; static int __init rcu_nocb_setup(char *str) { alloc_bootmem_cpumask_var(&rcu_nocb_mask); - if (cpulist_parse(str, rcu_nocb_mask)) { - pr_warn("rcu_nocbs= bad CPU range, all CPUs set\n"); - cpumask_setall(rcu_nocb_mask); + if (*str == '=') { + if (cpulist_parse(++str, rcu_nocb_mask)) { + pr_warn("rcu_nocbs= bad CPU range, all CPUs set\n"); + cpumask_setall(rcu_nocb_mask); + } } rcu_nocb_is_setup = true; return 1; } -__setup("rcu_nocbs=", rcu_nocb_setup); +__setup("rcu_nocbs", rcu_nocb_setup); static int __init parse_rcu_nocb_poll(char *arg) { -- 2.25.1
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