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| author |   Zqiang <qiang1.zhang@intel.com> | 2022-06-16 21:53:47 +0800 |
|---|---|---|
| committer |   Paul E. McKenney <paulmck@kernel.org> | 2022-08-31 05:03:14 -0700 |
| commit | 6d60ea03ac2d3dcf6ddee6b45aa7213d8b0461c5 (patch) | |
| tree | 8ba1521d2d801198d433b30e85054db9afd9799c | |
| parent | Linux 6.0-rc1 (diff) | |
| download | linux-dev-6d60ea03ac2d3dcf6ddee6b45aa7213d8b0461c5.tar.xz linux-dev-6d60ea03ac2d3dcf6ddee6b45aa7213d8b0461c5.zip | |
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>
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 1 |
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); } |