Paul E. McKenney 46470cf85d
srcu: Prevent cleanup_srcu_struct() from freeing non-dynamic ->sda ...
When an srcu_struct structure is created (but not in a kernel module)
by DEFINE_SRCU() and friends, the per-CPU srcu_data structure is
statically allocated. In all other cases, that structure is obtained
from alloc_percpu(), in which case cleanup_srcu_struct() must invoke
free_percpu() on the resulting ->sda pointer in the srcu_struct pointer.
Which it does.
Except that it also invokes free_percpu() on the ->sda pointer
referencing the statically allocated per-CPU srcu_data structures.
Which free_percpu() is surprisingly OK with.
This commit nevertheless stops cleanup_srcu_struct() from freeing
statically allocated per-CPU srcu_data structures.
Co-developed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com >
Signed-off-by: Neeraj Upadhyay <quic_neeraju@quicinc.com >
Signed-off-by: Paul E. McKenney <paulmck@kernel.org >
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46470cf85d