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# Android kernel headers
This project contains the original kernel headers that are used to generate
Bionic's "cleaned-up" user-land headers.
They are mostly covered by the GPLv2 + exception, and thus cannot be
distributed as part of the platform itself. The cleaned up headers do not
contain copyrightable information and are distributed with bionic.
## Regenerating the bionic headers
Note that if you're actually just trying to expose device-specific headers
to build your device drivers, you shouldn't modify these headers or bionic.
Instead use `TARGET_DEVICE_KERNEL_HEADERS` and friends as described in
[config.mk](https://android.googlesource.com/platform/build/+/master/core/config.mk#186).
Otherwise see the
[bionic/libc/kernel docs](https://android.googlesource.com/platform/bionic/+/master/libc/kernel/)
for how to actually take an update.
## Manually modified headers
The `modified/scsi` directory contains a set of manually updated headers.
The scsi kernel headers were never properly made to into uapi versions,
so this directory contains the unmodified scsi headers that are imported
into bionic. The generation script will indicate if these files have
changed and require another manual update.
The files from the scsi directory will be copied into bionic after
being processed as is, unless there exists a file of the same name in
`../modified/scsi`. Any files found in the modified directory completely
replace the ones in the scsi directory.
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