Can this occur? sys_open() does
lock_kernel()
filp_open() -> module open code: does MOD_INC_USE_COUNT.
unlock_kernel()
sys_delete_module() does
lock_kernel()
Test module in use.
free_module()
unlock_kernel()
AFAICT, both the module open routine and the module unloading code run
under the big kernel lock, no races are possible.
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