MOD_INC_USE_COUNT, MOD_DEC_USE_COUNT - Support reference counting of modules
The reference count is used by the kernel to know when a module is no longer in use by the device or application software. A MOD_INC_USE_COUNT(9) is generally placed in the open entry for a driver, and a MOD_DEC_USE_COUNT(9) in the release for the driver, to count the number of times the device has been opened, and thus prevent the module being unloaded when in use. The device driver may increment the use count other times, such as when memory is mapped or the module must remain loaded for external events.
If the device driver is not compiled as a module (MODULE is not defined) then the macro reduces to no behavior.
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Created 1996-2021 by Maxim Chirkov
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