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rcu: Add READ_ONCE() to rcu_do_batch() access to rcu_cpu_stall_ftrace_dump 

Given that sysfs can change the value of rcu_cpu_stall_ftrace_dump at any
time, this commit adds a READ_ONCE() to the accesses to that variable.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-06-23 20:57:59 -07:00
parent fe63b723cc
commit 1ef5a442a1
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree_stall.h
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@ -623,7 +623,7 @@ static void check_cpu_stall(struct rcu_data *rdp)
/* We haven't checked in, so go dump stack. */
print_cpu_stall(gps);
if (rcu_cpu_stall_ftrace_dump)
if (READ_ONCE(rcu_cpu_stall_ftrace_dump))
rcu_ftrace_dump(DUMP_ALL);
} else if (rcu_gp_in_progress() &&
@ -632,7 +632,7 @@ static void check_cpu_stall(struct rcu_data *rdp)
/* They had a few time units to dump stack, so complain. */
print_other_cpu_stall(gs2, gps);
if (rcu_cpu_stall_ftrace_dump)
if (READ_ONCE(rcu_cpu_stall_ftrace_dump))
rcu_ftrace_dump(DUMP_ALL);
}
}