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rcu: Mark rcu_cpu_kthread() accesses to ->rcu_cpu_has_work

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The rcu_data structure's ->rcu_cpu_has_work field can be modified by
any CPU attempting to wake up the rcuc kthread.  Therefore, this commit
marks accesses to this field from the rcu_cpu_kthread() function.

This data race was reported by KCSAN.  Not appropriate for backporting
due to failure being unlikely.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2023-04-07 16:47:34 -07:00
parent 9146eb2549
commit a24c1aab65
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree.c
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@ -2481,12 +2481,12 @@ static void rcu_cpu_kthread(unsigned int cpu)
*statusp = RCU_KTHREAD_RUNNING;
local_irq_disable();
work = *workp;
*workp = 0;
WRITE_ONCE(*workp, 0);
local_irq_enable();
if (work)
rcu_core();
local_bh_enable();
if (*workp == 0) {
if (!READ_ONCE(*workp)) {
trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
*statusp = RCU_KTHREAD_WAITING;
return;