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authorZqiang <qiang1.zhang@intel.com>2022-06-16 21:53:47 +0800
committerPaul E. McKenney <paulmck@kernel.org>2022-08-31 05:03:14 -0700
commit6d60ea03ac2d3dcf6ddee6b45aa7213d8b0461c5 (patch)
tree8ba1521d2d801198d433b30e85054db9afd9799c /kernel/rcu/tree_plugin.h
parent568035b01cfb107af8d2e4bd2fb9aea22cf5b868 (diff)
rcu: Fix rcu_read_unlock_strict() strict QS reporting
Kernels built with CONFIG_PREEMPT=n and CONFIG_RCU_STRICT_GRACE_PERIOD=y report the quiescent state directly from the outermost rcu_read_unlock(). However, the current CPU's rcu_data structure's ->cpu_no_qs.b.norm might still be set, in which case rcu_report_qs_rdp() will exit early, thus failing to report quiescent state. This commit therefore causes rcu_read_unlock_strict() to clear CPU's rcu_data structure's ->cpu_no_qs.b.norm field before invoking rcu_report_qs_rdp(). Signed-off-by: Zqiang <qiang1.zhang@intel.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree_plugin.h')
-rw-r--r--kernel/rcu/tree_plugin.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 438ecae6bd7e..86772c95ed0a 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -824,6 +824,7 @@ void rcu_read_unlock_strict(void)
if (irqs_disabled() || preempt_count() || !rcu_state.gp_kthread)
return;
rdp = this_cpu_ptr(&rcu_data);
+ rdp->cpu_no_qs.b.norm = false;
rcu_report_qs_rdp(rdp);
udelay(rcu_unlock_delay);
}