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When the module is loaded, the values for the symbols used by the module are compared with the ones in the kernel.
If the values match, the module is loaded; otherwise the load fails.
This also ensures the partitions are mounted in both Android and Charger modes. where a vendor kernel module pre-built repository is mapped into the Android build at the location listed above.
The recovery image is likely to contain a subset of the vendor modules.
The Android build defines the variable provides a workaround by detecting breakages in the ABI.
This feature calculates a Cyclic Redundancy Check (CRC) value for the prototype of each exported symbol in the kernel and stores the values as part of the kernel; for symbols used by a kernel module, the values are also stored in the kernel module.
In the future, we want to move towards a single binary distribution of kernel per-So C.
As a starting point, the following kernel-config options (or their kernel-version equivalent) have been added to in all common kernels and must be enabled in all device kernels: On devices required to support verified boot, Android requires the kernel modules to be in the partitions that have dm-verity enabled.If kernel modules are being used, requirements for their placement in filesystem are as follows: partitions are not mounted early.In Android 8.0, to make module loading from these partitions possible, provisions have been made to mount partitions early for both non-A/B and A/B devices.Today, So C kernels are treated similar to the common kernel; they are also heavily replicated in board–specific repos.This distribution model causes them to be fixed differently for the same bug in each branch, delaying future updates to the kernel due to cherry–picking at different times or fixing the same bug differently.