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149fc78735
Fix a sparse warning by using rcu_dereference(). Technically this is a
bug and a sufficiently aggressive compiler could reload the `real_parent'
pointer outside the protection of the rcu lock (and access freed memory),
but I think it's pretty unlikely to happen.
Link: https://lkml.kernel.org/r/20210221194207.1351703-1-willy@infradead.org
Fixes:
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.. | ||
autogroup.h | ||
clock.h | ||
coredump.h | ||
cpufreq.h | ||
cputime.h | ||
deadline.h | ||
debug.h | ||
hotplug.h | ||
idle.h | ||
init.h | ||
isolation.h | ||
jobctl.h | ||
loadavg.h | ||
mm.h | ||
nohz.h | ||
numa_balancing.h | ||
prio.h | ||
rt.h | ||
sd_flags.h | ||
signal.h | ||
smt.h | ||
stat.h | ||
sysctl.h | ||
task.h | ||
task_stack.h | ||
topology.h | ||
types.h | ||
user.h | ||
wake_q.h | ||
xacct.h |