Main Linux kernel vs Ubuntu kernel

[valdis.kletnieks at vt.edu]

On Sat, 09 Jun 2018 17:17:45 +0530, Subhashini Rao Beerisetty said:

> My question related to backward compatibility is: If an API’s signature
> changed from kernel version x.y.z onwards, does the mainline tree code uses
> the below mentioned logic?

> #if LINUX_VERSION_CODE >= KERNEL_VERSION(x,y,z)

No, because whenever an in-kernel API is changed, the person changing it
is responsible for fixing all the in-tree uses of the API.  You only see
the #ifdef above for out-of-tree drivers.
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